http://i146.photobucket.com/albums/r...6/problem2.jpg

I'm not sure how to do this one.

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- Nov 30th 2008, 02:28 PMNeverendingwriting in terms of theta
http://i146.photobucket.com/albums/r...6/problem2.jpg

I'm not sure how to do this one. - Nov 30th 2008, 03:06 PMTheEmptySet
$\displaystyle x=3\sin(\theta) \implies \sin(\theta)=\frac{x}{3}$

Attachment 9017

Using the pythagorean theorem we get the unknown side of the triangle as $\displaystyle \sqrt{9-x^2}$

So we get that

$\displaystyle \cos(\theta) =\frac{\sqrt{9-x^2}}{3} \implies \sqrt{9-x^2}=3\cos(\theta)$ - Nov 30th 2008, 04:14 PMNeverending
wow i've never done something like this before. Thanks for showing me the method!