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help? :confused:

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- Feb 5th 2006, 05:34 PMsnazZyI need Calc Help!
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help? :confused: - Feb 5th 2006, 09:00 PMCaptainBlack
Q:

Evaluate

$\displaystyle \int \frac{\sqrt{9-x^2}}{x^2} dx$

Try the change of variable:

$\displaystyle x=3\cos(u)$.

Which transforms the integral to:

$\displaystyle -\int \tan ^2(u) du =u-\tan(u)$,

if I have done this right, and from here bob's your uncle

RonL