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352__Differential Equations_[Ch. 9 If cp(a i bi) ^ 0, then we put Y = e ax [SN (x) cos bx + TN (x) sin bx], where S^(x) and Tu(x) are polynomials of degree N-max {n, m}, But if cp(a &/) = 0, then K = x r e ax [Stf (x) cos 6* + TN (x) sin to] , where r is the multiplicity of the roots a bi (for second-order equations, r=l). In the general case, the method of variation of parameters (see Sec. 11) is used to solve equation (3). Example 1. Find the general solution of the equation 2y" y' y 4xe 2 *. Solution. The characteristic equation 2& 2 & l=u has roots fc,~l and fc 2 = . The general solution of the corresponding homogeneous equation (first type) is f/ ==C 1 e* + C 2 e 2 . The right side of the given equation is/ (x) = =4xe zx =t ax P n (x). Hence, Y = e zx (Ax + B), since n=l and /=0. Diflerentiating Y twice and putting the derivatives into the given equation, we obtain: %,** (4 A X + 45 + 4^) __ e i* (2Ax + 25 + A) e 2* (Ax H- B) 4xe zx . Cancelling out e zx and equating the coefficients of identical powers of x arid the absolute terms on the left and right of the equality, we have bA=4 and 4 28 744-5fl = 0, whence 4 = -=- and 5 = -. o Jo Thus, K^ 2A f -g-* oH ) anc^ * ne g ei]eral solution of the given equation is Example 2. Find the general solution of the equation y* 2y f + y = xe* . 2 k 2/f-f- 1 has a double root Solution. The characteristic equation ft=l The ri^ht side of the equation is o! the form f(x)xe x \ here, 0=1 and n=-l. The particular solution is Y =x*e* (Ax + B), since a coincides \nHth the double root k=-\ and, consequently, r = 2. Diilerentiating Y twice, substituting into the equation, and equating the coefficients, we obtain /l = - equation will be written in the form , fl = 0, Hence, the general solution of the given * l Example 3, Find the general solution of the equation */*-f y= Solution. The characteristic fe equation 2 -j-l=r() has roots /' /?, and fc = a i. The general solution ot the corresponding homogeneous equation will |see 3, where a~0 and P = l| be* The right side is of the form
Sec. 12] Linear Differential Equations with Constant Coefficients_353 where a = 0, 6=1, P n (jc)=0, Q OT (*) = *. To this side there corresponds the particular solution Y, (here, #=1, a = 0, fc=l, r=l). Differentiating twice and substituting into the equation, we equate the coefficients of both sides in cos*, xcosx, sin*, and xsmx. We then get four equations 2A + 2D = 0, 4C = 0, -25 + 20 = 0, 44 = 1, from which we deter- 1 1 X2 X mine A = = , 0, C = 0, D = . Therefore, K= cos * -f- -j- sin *. 4 4 44 The general solution is x2 x y = C, cos jc + C 2 sin x -j- cos A: + -7- sin *. 3. The principle of superposition of solutions. If the right side of equation (3) is the sum of several functions and K/(/ = l, 2, 3, . .., n) are the corresponding solutions of the equations then the sum is the solution of equation (3). tions: y'+py'+w^-fiW (< = i. 2..... n). y = Y l + Y n +...+Y n Find the general solutions of the equations: 2976. tf 5y'6y = Q. 2982. y" + 2y' 2977. if 9y = 0. 2983. / 4y' 2978. yy'^Q. 2984. y" + ky 2979. iT + y = 0. 2985. y= f 2980. ^_2i/ +2j/ = 0. 2981. / + 40' +130 = 0. Find the particular solutions that satisfy the indicated condi- 2987. y"5tj'-\-4y = Q\ y = 5 t y' = 8 for * = 2988. y"+ 3tf' +20 = 0; y=5 1, 0' = 1 for jc0. f 2989. 0" + 40 = 0; = 0, = 2 for x = 0. 2990. 0^ + 20' = 0; 0=1, 0'=0 for ^ = 2991. /=; = a, 0' = for x = 0. 2992. 0" + 30'=0; = for x = and = for x = 3. 2993. 0" + ji f = 0; = for jc = and = for x=l. 2994. Indicate the type of particulai solutions for the given inhomogeneous equations: 12-1900 a) 0"-40 = A:V x ; b) 0" + 90 = cos 2x\
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TEXT FLY WITHIN THE BOOK ONLY
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OUP-43 30-1.71 5,000 OSMANIA UNIVER
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T. C. BapaneHKoe. C. M. Koean, r Jl
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TO THE READER MIR Publishers would
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Contents Sec. 6. Integrating Certai
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8 Chapter Contents Sec. 13. Linear
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Sec. 1. Functions Chapter I INTRODU
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Sec 1] Functions 13 8. Find the rat
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Sec. 1]_Functions_15 34. Prove that
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Sec. 2] Graphs of Elementary functi
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Sec. 2] Graphs of Elementary functi
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Sec. 2] Graphs of Elementary Functi
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Sec. 3] Limits 23 For the existence
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Sec. 3] 179. Hm (Vn + 1 \f~n). n -+
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Sec. #] Limits 27 209. lim 210. lim
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^Sec 3] Limits Therefore, Example 9
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Sec. 31 Limits 31 269. a) 270. lim-
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Sec. 4] Infinitely Small and Large
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Sec. 4] Infinitely Small and Large
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Sec. 5] Continuity of Functions 37
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Sec. 5]_Continuity of Functions_39
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Sec. 5] Continuity of Functions 334
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Sec. 1] Calculating Derivatives Dir
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Sec. 1] Calculating Derivatives Dir
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Sec. 2]__Tabular Differentiation_47
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Sec. 2]_Tabular Differentiation_49
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Sec. 2] Tabular Differentiation_ 51
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Sec. 2] Tabular Differentiation 504
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Sec. 2] Tabular Differentiation 55
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Sec. 3] The Derivatives of Function
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Sec. 3] The Derivatives of Function
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Sec 4] Geometrical and Mechanical A
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Sec. 4\ Geometrical and Mechanical
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Sec. 4] Geometrical and Mechanical
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Sec. 5]_Derivatives of Higher Order
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Sec. 5]_Derivatives of Higher Order
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Sec. 6] Differentials of First and
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Sec. 6}_Differentials of First and
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Sec. 7]_Mean-Value Theorems_75 745.
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Sec. 8] Taylor's Formula 77 765. a)
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Sec. 9]_ V Hospital-Bernoulli Rule
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Sec. 9] L' Hospital-Bernoulli Rule
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Chapter III THE EXTREMA OF A FUNCTI
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Sec. 1] The Extrema of a Function o
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Sec. 2]_The Direction of Concavity.
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Sec. 3]_Asymptotes_93 Example 2. Fi
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Sec. 3]_Asymptotes_95 Solution. Sin
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Sec 4] Graphing Functions by Charac
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CM CM -h CO O non ' > C " -~ a - >
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Sec. />] Differential of an Arc. Cu
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Sec 5] Differential of an Arc. Curv
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Sec. 5]_Differential of an Arc. Cur
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Sec. 1. Direct Integration 1. Basic
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Sec 1] Direct Integration_109 1048*
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Sec. 2] Integration by Substitution
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Sec. 2] Integration by Substitution
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Sec. 3\_Integration by Parts_H7 Exa
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Sec 4] Standard Integrals Containin
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Sec. 5] Integration of Rational Fun
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Sec. 5] In t egration of Rational F
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Sec. 6] Integrating Certain Irratio
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Sec. 6] Integrating Certain Irratio
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Sec. 7]_Integrating Trigonometric F
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Sec. 7]_Integrating Trigonometric F
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Sec. 8] Integration of Hyperbolic F
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Sec. 11] Using Reduction Formulas 1
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Sec. 12] Miscellaneous Examples on
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Sec. 1] The Definite Integral as th
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Sec. 2]_Evaluating Definite Integra
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Sec. 3]_Improper Integrals_143 Sec.
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Sec. 3] Improper Integrals 145 Solu
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Sec. 4] Change of Variable in a Def
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Sec. 5] Integration by Parts 149 Bu
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Sec. 6] Mean-Value Theorem 151 In p
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Sec. 7] The Areas of Plane Figures
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Sec. 7] The Areas of Plane Figures
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Sec. 7\_The Areas of Plane Figures_
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Sec. 8] The Arc Length of a Curve 1
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Sec, 9] Volumes of Solids 161 1673.
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Sec. 9] Volumes of Solids 163' Solu
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Sec. 9]_Volumes of Solids_165 1693.
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Sec. 10] The Area of a Surface of R
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Sec. II] Moments. Centres of Gravit
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Sec 11] Moments. Centres of Gravity
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&?c. 12] Applying Definite Integral
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Sec. 12] Applying Definite Integral
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Sec. 1) Basic Notions [SI Putting *
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Sec. 1]_Basic Notions_183 1790*. Le
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Sec. 3] Partial Derivatives 185 180
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Sec. 4]_Total Differential of a Fun
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Sec. 4}_Total Differential of a Fun
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Sec. 5]_Differentiation of Composit
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Sec. 6]_Derivative in a Given Direc
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Sec. 6] Derivative in a Given Direc
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Sec. 7]_Higher-Order Derivatives an
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Sec. 7] Higher-Order Derivatives an
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Sec. 7]_Higher-Order Derivatives an
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Sec. ti\_Integration of Total Diffe
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Sec. 9]_Differentiation of Implicit
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Sec. 9] Differentiation of Implicit
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Sec. 9]_Differentiation of Implicit
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Sec. 10]_Change of Variables_2H 196
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Sec. 10]_Change of Variables_213 or
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Sec. 10] Change of Variables 215 an
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Sec. 11]_The Tangent Plane and the
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Sec. 11]_The Tangent Plane and the
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Sec. 12] Taylor's Formula for a Fun
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Sec. 13]_The Extremum of a Function
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Sec. 13] The Extremutn of a Functio
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Sec. 14] Finding the Greatest and S
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Sec. 14] Finding the Greatest and S
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Sec. 15] Singular Points of Plane C
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Sec. 16] Envelope 233 Solution. The
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Sec. 18] The Vector Function of a S
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Sec. 18]_The Vector Function of a S
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Sec. 19] The Natural Trihedron of a
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Sec. 19] The Natural Trihedron of a
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Sec. 20] Curvature and Torsion of a
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Sec. 20]_Curvature and Torsion of a
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Sec. 1] The Double Integral in Rect
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Sec. 2]_Change of Variables in a Do
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Sec. 2]_Change of Variables in a Do
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Sec 3]_Computing Areas_257 2177. Co
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Sec. 5]_Computing th Area* of Surfa
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Sec. 6]_Applications of the Double
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Sec. 7] Triple Integrals 2o3 Evalua
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Sec 7\ Triple Integrals 265 We ther
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gee. 7]_Triple Integrals_267 2251.
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Sec. 8] Improper Integrals Dependen
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Sec. 8]_Improper Integrals Dependen
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See. 9] Line Integrals 273 Test for
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Sec. 9]____Line Inlegtah____275 whe
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Sec. 9]_Line Integrals__277 express
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Sec. 9] Lim Integrals 279 (/-axis;
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Sec 9] Line Integrals 281 Evaluate
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Sec. 9] Line Integrals 2S& D. Appli
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Sec. 10] Surface Integrals 285 When
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ec. 11]_The Ostrogradsky-Gauss Form
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Sec. 12] Fundamentals of Field Theo
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Sec. 12] Fundamentals of Field Theo
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Sec. 1. Number Series Chapter VIII
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Sec. 1]_Number Series_295 c) D'Alem
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Sec /\_Number Series_297 Note. For
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2418. + + 0419 J___1_ . 4- 4- 4- '
Page 307 and 308: Sec. 1] Number Series 2464. cos-2-)
Page 309 and 310: Sec. 1]_Number Series_303 - V r(2-Q
Page 311 and 312: Sec. 2]_Functional Series_305 In th
Page 313 and 314: Sec. 2]_Functional Series_307 [the
Page 315 and 316: Sec. 2] Functional Series 309 Deter
Page 317 and 318: Sec. 3]_Taylor's Series_311 v8 s r
Page 319 and 320: Sec. 3] Taylor's Series 313 Since a
Page 321 and 322: Sec 3} Taylor's Series 315 2615. ln
Page 323 and 324: Sec. 3] Taylor's Series 317 2651. F
Page 325 and 326: Sec. 4] Fourier Series 319 If a fun
Page 327 and 328: Sec. 4\__Fourier Series _321 2690.
Page 329 and 330: Sec 1 1 Verifying Solutions 323 It
Page 331 and 332: Sec. 21 First-Order Differential Eq
Page 333 and 334: Sec. 3] Differential Equations with
Page 335 and 336: Sec. 3\ Differential Equations with
Page 337 and 338: Sec. 4]_First-Order Homogeneous Dif
Page 339 and 340: Sec. 5] Bernoulli's Equation 333 Co
Page 341 and 342: Sec. 6] Exact Differential Equation
Page 343 and 344: Sec. 7] First-Order Differential Eq
Page 345 and 346: Sec 8]_The Lagrange and Clairaut Eq
Page 347 and 348: Sec. 9] Miscellaneous Exercises on
Page 349 and 350: Sec. 9] Miscellaneous Exercises on
Page 351 and 352: Sec. 10] Higher-Order Differential
Page 353 and 354: Sec. 10]__Higher-Order Differential
Page 355 and 356: Sec. 11]_Linear Differential Equati
Page 357: Sec. 12] Linear Differential Equati
Page 361 and 362: Sec. 12] Linear Differential Equati
Page 363 and 364: Sec. 14]_Euler's Equations__357 Fin
Page 365 and 366: Sec. 15]_Systems of Differential Eq
Page 367 and 368: .Sec. 16} Integration of Differenti
Page 369 and 370: Sec. 17] Problems on Fourier's Meth
Page 371 and 372: Sec. 17]_Problems on Fourier's Meth
Page 373 and 374: Chapter X APPROXIMATE CALCULATIONS
Page 375 and 376: Sec. 1] Operations on Approximate N
Page 377 and 378: Sec. /]_Operations on Approximate N
Page 379 and 380: Sec, 2] Interpolation of Functions
Page 381 and 382: Sec. 2] Interpolation of Functions
Page 383 and 384: Sec. 3]_Computing the Real Roots of
Page 389 and 390: Sec. 4] Numerical Integration of Fu
Page 391 and 392: Sec. 5] Numerical Integration of Or
Page 398 and 399: Table 3. Basic Table for Calculatin
Page 400 and 401: 394 Approximate Calculations \Ch 10
Page 402 and 403: ANSWERS Chapter I 1. Solution. Sinc
Page 404 and 405: 398 Answers Form a table of values:
Page 406 and 407: 400 Answer* 271. Solution. If x & k
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402 Answers b) /'(!)= lim 1^15^= li
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404_Answers 494. , . 495. - - . 1 2
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-406 Answers 640. Hint. The equatio
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408_Answers_ 755. e xcosa sin(*sina
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410_Answers_4 where R is the radius
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412 Answers 1/~JT f Q \ J/max = TT=
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414 Answers 976. j/mi n =1.32 when
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416 Answers 1037. j/ 1040. 3x* 13 J
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418 1 1137. 4- 6 3a . In I ocot3x|
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420 Answers 4^8 Problem 1218*. 1221
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422 Answers X arctan(* + 2). 1294.
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424 Answers sin 5* , 1374. -!- 1377
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426 Answers 3 1442. In l-x2 ' '" 2
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428_Answers_ the function /(x) = --
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430 Answers 1651. 3na 2 . 1652. n(b
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432 Answers inertia /=Y 2jttf 1 r *
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434 Answers along the large lower s
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436 Answers cos^. ,810. * ox x* x d
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438_Answers 1905. 1914. u(*. !/) =
Page 446 and 447:
440 Answers 1983. 3* + 4j/-H2z 169
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442 Answers is ~ |/2 + -~=, the alt
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444 Answers (binormal). 2103. bx *=
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444_Answers_x = \ ' > (principal no
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446 Answers 2 a a a 2139. ( dy(f(x,
Page 456 and 457:
448_Answers_ r 4 **/* [ rj-cos*(p--
Page 458 and 459:
450 Answers 2243. 2244. 1 i VT=T* ^
Page 460 and 461:
452 Answers 2 t 2297. ) ~ll . |-[(I
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454_Answers__ TtD the flux, use the
Page 464 and 465:
456__Answers_ and when x | ^ =- , t
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458 Answers
Page 468 and 469:
460 Answers %-l n=o (n)=^=%. 2873.
Page 470 and 471:
462 Answers Chapter IX 2704. Yes. 2
Page 472 and 473:
464 Answers 2822. g-C*+; y=2*. 2824
Page 474 and 475:
466 Answers x + C z . 2914. #=
Page 476 and 477:
468_Answers_ A $007. 1) x = C cosco
Page 478 and 479:
470 Answers 3081. x = C l e 3082. x
Page 480 and 481:
472 Answers ,*. f (2"+ 1)JtJf dx. H
Page 482 and 483:
474 Answers 3131. a) 0.211; 0.389;
Page 484 and 485:
476 Appendix III. Inverse Quantitie
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478 Appendix IV. Trigonometric Func
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480 Appendix VI. Some Curves (for R
Page 490 and 491:
482 Appendix 11. Graphs //-=secx an
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486 Appendix 24. Strophoid, * u s^-
Page 494 and 495:
Absolute error Absolute value 367 o
Page 496 and 497:
490 Index Differential equations of
Page 498 and 499:
492 Index Infinite discontinuities
Page 500 and 501:
494 Index Operator Hamiltonian 288
Page 502:
496 Index Taylor's series Term 311,
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