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

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Answers 443<br />

2085. x=cosacoso); y s<strong>in</strong> acoscof; z = s<strong>in</strong>cof (circle); v = cof cos a s<strong>in</strong> art<br />

co/ s<strong>in</strong> a s<strong>in</strong> of + cofc cos CD* ; v = co<br />

| |; w co 2 / cos a cos CD/ cous<strong>in</strong><br />

uy = a> 2 . 2086. u = K i + i<br />

r 2<br />

. 2088. 0"|/ a + /i2 ,<br />

screw . 2089. V aV + u 2<br />

= -y- (* fc). 2091. T= --<br />

where w = -<br />

is the angular speed<br />

, 2aa>u s<strong>in</strong> (o* . 2090. T = -<br />

a cos a>/<br />

of rotation of the<br />

(* + *); v = /; p =<br />

[(cos t s<strong>in</strong> * + (s<strong>in</strong> t + cos t)J + k]\ v =<br />

^ 1 1^3^ /\<br />

= -- - /<br />

[(s<strong>in</strong> + cosO /+(s<strong>in</strong> t cos 0./J*. COS(T, = 2) -; cos(v,z)=0.<br />

- (tangent);<br />

a cost b<br />

2092. t ; ^"<br />

"; P^=. 2093.<br />

/105 /5<br />

r =- (b<strong>in</strong>ormal)<br />

/ ., .. ^ acos/ y as<strong>in</strong>t zbt ... u .<br />

.<br />

\ *> /<br />

, . ^r-<br />

^ s<strong>in</strong> ^ &cos/ a<br />

x-acost .<br />

y- ^-- normal) The directi on cos<strong>in</strong>es of<br />

VI '<br />

cos t smt<br />

a s<strong>in</strong> / a cos f b<br />

the tangent are cos a =--=== cos p = == ; cos Y =<br />

The direction cos<strong>in</strong>es of the pr<strong>in</strong>cipal normal are cosa, = cos/; cos|J 1 = s<strong>in</strong>/;<br />

cos YI = 0. 2094. 2* z = (normal plane); y 1 = (osculat<strong>in</strong>g plane);<br />

x + 2z 5 = (rectify<strong>in</strong>g plane). 2095. *"T =^T ~T?T (tangent); x +<br />

+ 4r/-f-12z 114 = (normal plane); 12* 6r/-f-z 8 = (oscu^at<strong>in</strong>g plane).<br />

2096.<br />

p = j<br />

= j<br />

-_ _ _<br />

y<br />

z<br />

(tangent); ^<br />

= _ 1 /4 =_ 2^ t<br />

2 I \<br />

: cipal normal); = = __t>r TT~ (b<strong>in</strong>ormal); ^ilx* """3"'<br />

M 2<br />

(pri "~<br />

(4, |, 2V 2097. ^.=^l = i^l (tangent); jc + = i/ (osculat-<br />

.<br />

2 , y + 2 z 2 . .<br />

/<br />

, u * 2 i/ + 2 z--2<br />

<strong>in</strong>g plane); = =<br />

^-~j-<br />

^ (pr<strong>in</strong>cipal normal); = - =<br />

-g<br />

1 1<br />

2 =-=; cosp 2 =-, cosv, = 0. 2098. a)<br />

(tangent); x /2 z= (normal plane); b)<br />

(tangent);<br />

__<br />

x + # + 4z-10 = (normal plane); c) =^"' ^|1 2<br />

^ 3 2<br />

==<br />

Z ""J:<br />

f O ~~A f 3<br />

(tangent); 2_>^3 x + r/ 2/*3z = (normal plane); 2099. x + y = 0. 2100. x<br />

2|/*2^=0. 2101. a) 4* # z 9 = 0; b) 9x 6y + 2z 18 = 0;<br />

c) b*x\x a*yly + (a 2<br />

6 2<br />

)ejz = a 2 6 2<br />

(a 2<br />

<strong>in</strong>g plane); ~ = - = (P r<strong>in</strong>ci P al normal);<br />

6 2<br />

). 2102. 6.r8/z + 3 = (osculat

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