Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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J88 Functions of Several Variables [Ch. 6 Solution. f(x+Ax, y + Ay) = (x -f Ax) 2 -f (x + A*) (y -f- Ay) (y -f Ay) 2 ; = 2x Ax + AA 2 + x - Ay + y Ax + Ax Ay 2y Ay Ay a = = [(2x + y) A* + (x 2y) A^l + (A* 2 + AA> Ay Ay Here, the expression d/ = (2x + y) A* -{-(* 2y) Ay is the total differential of the function, while (A* 2 -f AJC* AyAy2 ) is an infinitesimal of higher order comared with VAx 2 +Ay 2 . compared with . 2. Find the total differential of the function Example Solution. 3. Applying the total differential of a function to approximate calculations. For sufficiently small |AA:| and |Ay| and, hence, for sufficiently small Q= y Av 2 -f Ay 2 , we have for a differentiate function z = f(x t y) the approximate equality Az^dz or . dz Example 3. The altitude of a cone is // = 30cm, the radius of the base fl = 10cm. How will the volume of the cone change, if we increase H by 3mm and diminish R by 1 mm? Solution, The volume of the cone is V = -~-nR 2 H. The change in volume we replace approximately by AV =^ dV = -j n (2RH dR + R* dH) = the differential o = lji( 2.10.30.0.1 + 100.0.3) = lOjiss 31. 4 cm*. 3 Example 4. s -01 Compute 1.02 approximately. Solution. We consider the function z^x^. The desired number may be considered the increased value of this function when jc=l, y = 3, Ajc = 0.02, Ay = 0.01. The initial value of the function z = s l =l, Hence, 1.02 8 -01 ^ 1+0.06=1.06. In x Ay = 3-1.0.02+ 1- In 1-0.01 =0.06. 1831. For the function f(x,y) = x*y find the total increment and the total differential at the point (1, 2); compare them if a) Ax=l, A//-2; b) A* = 0.1 f Ay = 0.2. 1832. Show that for the functions u and v of several (for example, two) variables the ordinary rules of differentiation holcb v du udv
Sec. 4}_Total Differential of a Function_189 Find the total differentials of the following functions: 1836. z = si 1841. z- In tan i. x 1837. 1838. 2=yx?. z = ln(x*+y*). 1844. u = 1839. /*, = lnl+i. 1845. u= 1842. Find df(l, K tj) ~*' 1), if 1843 - " = 1840. 2 = arc tan -2-+ 1846. w = arctan^. + arctan-*. 1847. Find d/ (3, 4, 5) if 1848. One side of a rectangle is a = 10 cm, the other & = 24cm. How will a diagonal / of the rectangle change if the side a is increased by 4 mm and b is shortened by 1 mm? Approximate the change and compare it with the exact value. 1849. A closed box with outer dimensions 10 cm, 8 cm, and 6 cm is made of 2-mm-thick plywood. Approximate the volume of material used in making the box. 1850*. The central angle of a circular sector is 80; it is desired to reduce it by 1. By how much should the radius of the sector be increased so that the area will remain unchanged, if the original leng:h of the radius is 20 cm? 1851. Approximate: a) (1.02)'- (0.97) 2 ; b) . . c) sin32-cos59 (when converting degrees into radius and calculating sin 60 take three significant figures; round off the last digit). 1852. Show that the relative error of a product is approximately equal to the sum of the relative errors of the factors. 1853. Measurements of a triangle ABC yielded the following data: side a=-100m2m. side fc = 200m3m, angle C 601. To what degree of accuracy can we compute the side c? 1854. The oscillation period T of a pendulum is computed from the formula
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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
Page 143 and 144: Sec. 12] Miscellaneous Examples on
Page 145 and 146: Sec. 1] The Definite Integral as th
Page 147 and 148: Sec. 2]_Evaluating Definite Integra
Page 149 and 150: Sec. 3]_Improper Integrals_143 Sec.
Page 151 and 152: Sec. 3] Improper Integrals 145 Solu
Page 153 and 154: Sec. 4] Change of Variable in a Def
Page 155 and 156: Sec. 5] Integration by Parts 149 Bu
Page 157 and 158: Sec. 6] Mean-Value Theorem 151 In p
Page 159 and 160: Sec. 7] The Areas of Plane Figures
Page 161 and 162: Sec. 7] The Areas of Plane Figures
Page 163 and 164: Sec. 7\_The Areas of Plane Figures_
Page 165 and 166: Sec. 8] The Arc Length of a Curve 1
Page 167 and 168: Sec, 9] Volumes of Solids 161 1673.
Page 169 and 170: Sec. 9] Volumes of Solids 163' Solu
Page 171 and 172: Sec. 9]_Volumes of Solids_165 1693.
Page 173 and 174: Sec. 10] The Area of a Surface of R
Page 175 and 176: Sec. II] Moments. Centres of Gravit
Page 177 and 178: Sec 11] Moments. Centres of Gravity
Page 179 and 180: &?c. 12] Applying Definite Integral
Page 181 and 182: Sec. 12] Applying Definite Integral
Page 187 and 188: Sec. 1) Basic Notions [SI Putting *
Page 189 and 190: Sec. 1]_Basic Notions_183 1790*. Le
Page 191 and 192: Sec. 3] Partial Derivatives 185 180
Page 193: Sec. 4]_Total Differential of a Fun
Page 197 and 198: Sec. 5]_Differentiation of Composit
Page 199 and 200: Sec. 6]_Derivative in a Given Direc
Page 201 and 202: Sec. 6] Derivative in a Given Direc
Page 203 and 204: Sec. 7]_Higher-Order Derivatives an
Page 205 and 206: Sec. 7] Higher-Order Derivatives an
Page 207 and 208: Sec. 7]_Higher-Order Derivatives an
Page 209 and 210: Sec. ti\_Integration of Total Diffe
Page 211 and 212: Sec. 9]_Differentiation of Implicit
Page 213 and 214: Sec. 9] Differentiation of Implicit
Page 215 and 216: Sec. 9]_Differentiation of Implicit
Page 217 and 218: Sec. 10]_Change of Variables_2H 196
Page 219 and 220: Sec. 10]_Change of Variables_213 or
Page 221 and 222: Sec. 10] Change of Variables 215 an
Page 223 and 224: Sec. 11]_The Tangent Plane and the
Page 225 and 226: Sec. 11]_The Tangent Plane and the
Page 227 and 228: Sec. 12] Taylor's Formula for a Fun
Page 229 and 230: Sec. 13]_The Extremum of a Function
Page 231 and 232: Sec. 13] The Extremutn of a Functio
Page 233 and 234: Sec. 14] Finding the Greatest and S
Page 235 and 236: Sec. 14] Finding the Greatest and S
Page 237 and 238: Sec. 15] Singular Points of Plane C
Page 239 and 240: Sec. 16] Envelope 233 Solution. The
Page 241 and 242: Sec. 18] The Vector Function of a S
Page 243 and 244: 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- '
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Sec. 1] Number Series 2464. cos-2-)
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Sec. 1]_Number Series_303 - V r(2-Q
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Sec. 2]_Functional Series_305 In th
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Sec. 2]_Functional Series_307 [the
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Sec. 2] Functional Series 309 Deter
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Sec. 3]_Taylor's Series_311 v8 s r
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Sec. 3] Taylor's Series 313 Since a
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Sec 3} Taylor's Series 315 2615. ln
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Sec. 3] Taylor's Series 317 2651. F
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Sec. 4] Fourier Series 319 If a fun
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Sec. 4\__Fourier Series _321 2690.
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Sec 1 1 Verifying Solutions 323 It
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Sec. 21 First-Order Differential Eq
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Sec. 3] Differential Equations with
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Sec. 3\ Differential Equations with
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Sec. 4]_First-Order Homogeneous Dif
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Sec. 5] Bernoulli's Equation 333 Co
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Sec. 6] Exact Differential Equation
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Sec. 7] First-Order Differential Eq
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Sec 8]_The Lagrange and Clairaut Eq
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Sec. 9] Miscellaneous Exercises on
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Sec. 9] Miscellaneous Exercises on
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Sec. 10] Higher-Order Differential
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Sec. 10]__Higher-Order Differential
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Sec. 11]_Linear Differential Equati
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Sec. 12] Linear Differential Equati
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Sec. 14]_Euler's Equations__357 Fin
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Sec. 15]_Systems of Differential Eq
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.Sec. 16} Integration of Differenti
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Sec. 17] Problems on Fourier's Meth
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Sec. 17]_Problems on Fourier's Meth
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Chapter X APPROXIMATE CALCULATIONS
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Sec. 1] Operations on Approximate N
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Sec. /]_Operations on Approximate N
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Sec, 2] Interpolation of Functions
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Sec. 2] Interpolation of Functions
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Sec. 3]_Computing the Real Roots of
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Sec. 4] Numerical Integration of Fu
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Sec. 5] Numerical Integration of Or
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Table 3. Basic Table for Calculatin
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394 Approximate Calculations \Ch 10
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ANSWERS Chapter I 1. Solution. Sinc
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398 Answers Form a table of values:
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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(*. !/) =
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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,
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448_Answers_ r 4 **/* [ rj-cos*(p--
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450 Answers 2243. 2244. 1 i VT=T* ^
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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
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460 Answers %-l n=o (n)=^=%. 2873.
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462 Answers Chapter IX 2704. Yes. 2
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464 Answers 2822. g-C*+; y=2*. 2824
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466 Answers x + C z . 2914. #=
Page 476 and 477:
468_Answers_ A $007. 1) x = C cosco
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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
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482 Appendix 11. Graphs //-=secx an
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486 Appendix 24. Strophoid, * u s^-
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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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