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

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J20 Indef<strong>in</strong>ite Integrals [Ch. 4<br />

3. Integrals of the form<br />

*<br />

f<br />

J (mx + n) V^ax' + bx + c<br />

verse substitution<br />

i = /<br />

mx+n<br />

these <strong>in</strong>tegrals are reduced to <strong>in</strong>tegrals of the form 2.<br />

Example 5. F<strong>in</strong>d<br />

dx<br />

whence<br />

Solution. We put<br />

= . By means of the <strong>in</strong>-<br />

4. Integrals of the form \ ]T ax*-\-bx + cdv. By tak<strong>in</strong>g the perfect square<br />

out of the quadratic tr<strong>in</strong>omial, the given <strong>in</strong>tegral is reduced to one of the<br />

follow<strong>in</strong>g two basic <strong>in</strong>tegrals (sec examples 1252 and 1253):<br />

1)<br />

2)<br />

(' V<br />

a* A' 2 dx = 4 fa^x* + ^ arc s<strong>in</strong> + C;<br />

J ^ 2 c/<br />

J Vl?<br />

Example 6.<br />

F<strong>in</strong>d the follow<strong>in</strong>g <strong>in</strong>tegrals:<br />

(a > 0);<br />

1256. ,c S P xdx<br />

'' 00 '<br />

J ^7^+<br />

s<strong>in</strong>

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