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

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154 Def<strong>in</strong>ite Integrals (Ch. 5<br />

Example 2. Evaluate the area bounded by the curve # = 2 */ y* and<br />

the /-axis (Fig. 42).<br />

Solution. Here, the roles of the coord<strong>in</strong>ate axes are changed and so the<br />

sought-for area is expressed by the <strong>in</strong>tegral<br />

where the limits of <strong>in</strong>tegration y = 2 and l i/ 2 =l are found as the ord<strong>in</strong>ates<br />

of the po<strong>in</strong>ts of <strong>in</strong>tersection of the curve with the t/-axis,<br />

Fig. 44<br />

a X<br />

Fig. 45<br />

In the more general case, if the area S is bounded by two cont<strong>in</strong>uous<br />

curves / = M*) and y = f 2 (x) and by two vertical l<strong>in</strong>es x = a and x = b, where<br />

/i(*XM*) wn n a

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