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

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452 Answers<br />

2 t<br />

2297. ) ~ll .<br />

|-[(I+4Ji<br />

i- .<br />

2292. Converges fot<br />

2298. 5m . 2299. a*V 2. 2300.^(56 /7~<br />

1). 2301. l-2-^! arc tan^ . 2302. 2jra 2 . 2303. ^(lOVTO 1). H<strong>in</strong>t.<br />

flu d ftl<br />

\ M* y)ds may be <strong>in</strong>terpreted geometrically as the area of a cyl<strong>in</strong>drical surc<br />

face with generatrix parallel to the z-axis, with base, the contour of <strong>in</strong>tegra<br />

tion, and with altitudes equal to the values "of the <strong>in</strong>tegrand. Therefore,<br />

/ o<br />

S= \ xds, where C is the arc OA of the parabola t/=--x 2 that connects the<br />

e<br />

/ a*b l/~a 2 po<strong>in</strong>ts (0, 0) and (4,6). 2304. a V~3. 2305. 2 [ b*-\<br />

V<br />

r<br />

V a<br />

arc s<strong>in</strong> ^<br />

h*\<br />

)<br />

.<br />

2 2<br />

b a<br />

/<br />

2306. V^ + u 2 f ji V r fl 2 2 + 4jTu<br />

4-|rln<br />

" "*"<br />

fl<br />

J . 2307. (-q fl .o a V<br />

2308. 2ita 2<br />

^aTT^ 2309. ,/ . 2310.40- 2311. 2jta 2 .<br />

V (a 2 + & 2<br />

)<br />

30<br />

4<br />

10<br />

2312. a) -5-; b) 0; c) ; T d) 4;e)4. 2313. In all cases 4. 2314. 2rc. H<strong>in</strong>t.<br />

o o<br />

Use the parametric equations of a circle. 2315. -r-a&2 .<br />

o<br />

2316. 2 s<strong>in</strong> 2.<br />

2317. 0. 2318. a) 8; b) 12; c) 2; d) A ; e ) \n(x + y); f)<br />

x a<br />

f 9(jc)rfjc-f<br />

//a<br />

+ { ty (y) dy- 2319. a) 62; b) 1; c)<br />

-<br />

-L + ln2; d) 1 J 4<br />

+ Y 2. 2320.<br />

y\<br />

Vl-fft 2 . 2322. a) x 2 + 3xy 2f/ 2 + C; b) x 8<br />

x z<br />

c) e*~<br />

y-{-x<br />

y (x + y) + C\ d) ln|Jt + |/| + C. 2323. 2na(a + b). 2324. n/? 2 cos 2 a<br />

2325. 1 fi- + j^"M 8 - 2326 - a > ~ 20 b > 0^ 1; c)5 K 2; d) 0. 2327. / =<br />

//, 2328. 4- 2329 - ^r-- 233 - 4-- 2331 - - 2332 - a ) Ol<br />

JJ o ^ d<br />

(S)<br />

b) 2/iJi. H<strong>in</strong>t In Case (b), Green's formula is used <strong>in</strong> the region between the<br />

contour C and a circle of sufficiently small radius with centre at the coord<strong>in</strong>ate<br />

orig<strong>in</strong> 2333. Solution. If we consider that the direction of the tangent<br />

co<strong>in</strong>cides with that of positive circulation of the contour, then cos(X,n)==<br />

= cos(y, 0=/. hence,

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