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

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144_Def<strong>in</strong>ite Integrals_[C/i. 5<br />

Example 1.<br />

f &_ lim "f"* + M f 4? = lim lim (I-lU (l-l<br />

J x2 e -K> J * 2<br />

e-*oJ* e->oVe / e-*oV e<br />

-i e<br />

and the <strong>in</strong>tegral diverges.<br />

Example 2.<br />

QO 6<br />

= lim (*rT^2= lim<br />

ft-oo J 1+^<br />

(arc tan 6 arc tan = ()) .<br />

2<br />

&-><<br />

2<br />

Example 3. Test the convergence of the probability <strong>in</strong>tegral<br />

Solution. We put<br />

*r<br />

00 1 00<br />

C e~ x* dx= C

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