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

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248_Mult<strong>ipl</strong>e and L<strong>in</strong>e Integrals_[Ch. 7<br />

if the region of <strong>in</strong>tegration 5 (Fig. 87) is bounded by the hyperbola y 2<br />

* 2 = 1<br />

and by two straight l<strong>in</strong>es * = 2 and x = 2 (we have <strong>in</strong> view the region con-<br />

ta<strong>in</strong><strong>in</strong>g the coord<strong>in</strong>ate orig<strong>in</strong>).<br />

Solution. The region of <strong>in</strong>tegration ABCD (Fig. 87) is bounded by the<br />

straight l<strong>in</strong>es x- 2 and x = 2 and by two branches of the hyperbola<br />

y=yT+* and (/--1<br />

that is, it belongs to the first type. We have:<br />

= J<br />

dx<br />

J<br />

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

Evaluate the follow<strong>in</strong>g iterated <strong>in</strong>tegrals:<br />

21 35<br />

2113.<br />

\dy\(jf + 2y)dx. 2117.<br />

Jdy J<br />

2114<br />

^pTv?- 2118. dcp rrfr.<br />

j<br />

31 o a s<strong>in</strong>

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