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

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Sec 4] Standard Integrals Conta<strong>in</strong><strong>in</strong>g a Quadratic Tr<strong>in</strong>omial 119-<br />

Example 1.<br />

dx _ 1<br />

(-*) =-o*~7=<br />

(-TJ+S '*?<br />

H- -7- g \2 Qi -o<br />

2 5 2<br />

arc tan<br />

If m&Q, then from the numerator we can take the derivative<br />

out of the quadratic tr<strong>in</strong>omial<br />

f - + .<br />

J a.v 2 + ^<br />

and thus we arrive at the <strong>in</strong>tegral discussed above.<br />

Example 2.<br />

-<br />

f -> , f" d -v -<br />

J ;5=^ni ^J A'-x-i<br />

IV 5 2x-l +<br />

.<br />

4<br />

2<br />

"S?+c.<br />

2. Integrals of the form I d*. The methods of calculation<br />

are similar to those analyzed above. The <strong>in</strong>tegral is f<strong>in</strong>ally reduced to tabu-<br />

lar <strong>in</strong>tegral V, if a > 0, and VI, if a < 0.<br />

Example 3.<br />

Example 4.<br />

dx 1<br />

r ^ + 3 ^^ f<br />

J yV+2x + 2<br />

*"<br />

2<br />

J ^ ^ + 2x4-2<br />

f* dx 1 4jt 3<br />

^<br />

^JC<br />

.<br />

2

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