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

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446<br />

Answers<br />

2 a a a<br />

2139. ( dy(f(x,y)dx + \ J<br />

o<br />

J J<br />

a_ a V 8<br />

dy<br />

a<br />

\<br />

c/<br />

Va*<br />

f(x,y)dx.<br />

i/ 2<br />

2 2~~<br />

2140<br />

.<br />

a _ fl ]/G 2 _ a<br />

r<br />

a _ a yl<br />

p<br />

a<br />

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20<br />

P<br />

2 V 20, 2d<br />

a _ y* a za 2 2a<br />

di/<br />

[dy /(*, */)dx + f(x,y)dx +<br />

j<br />

jd*/ J<br />

j<br />

o o o<br />

a+Vtf^H*<br />

1 _<br />

o yf 1^8 11-* T ^I*<br />

2141. J dx J<br />

f(x,y)* + f(x, y)*.<br />

jdxj 2142.<br />

j dx J 10 00 00<br />

VT i VT VT^lfi 2 VR*-y*<br />

1<br />

2<br />

jt arc s<strong>in</strong> y<br />

2144. fdf/ f /(A:, f/)dx. 2145. -g-<br />

o arc ^<strong>in</strong> y<br />

/ (x,<br />

/(A:, t/)efy. 2143. dy f(*,y)dx.<br />

. 2146.<br />

2149. 6. 2150. 1. 2151. In 2 2152. a) -| ; b)<br />

2153. -p 8 . 2154. dx xr/dt/ = .<br />

2156. |-Ji/?'.<br />

H<strong>in</strong>t, j<br />

1<br />

i o<br />

2JT/? // = /<br />

C // dx dr/ == C dx<br />

(S) o o<br />

-^ . 2147. ~ a. 2148.^-<br />

15jt<br />

^ 16<br />

2155.<br />

; c) 2 1- .<br />

" _<br />

*Jl /?(1-COS/)<br />

= \ /?(! cosO^ \ ydy> where the last <strong>in</strong>tegral is obta<strong>in</strong>ed from<br />

o<br />

o<br />

the preced<strong>in</strong>g one by the substitution x=R (* s<strong>in</strong> t). 2157. . 2158. -- .<br />

2159. flf<br />

+i--<br />

216 -<br />

Jt 1 ^<br />

T" s<strong>in</strong> q> ^T cos (p<br />

[(p no o<br />

T<br />

\ r/(rcos9, rs<strong>in</strong>(p)dr. 2161. \<br />

J J<br />

o<br />

D4<br />

1

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