writing in terms of theta

• November 30th 2008, 02:28 PM
Neverending
writing in terms of theta
• November 30th 2008, 03:06 PM
TheEmptySet
Quote:

Originally Posted by Neverending

$x=3\sin(\theta) \implies \sin(\theta)=\frac{x}{3}$

Attachment 9017

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

So we get that

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