1. ## Function help.

Hello guys.

I'm really not sure what to do with this, since I'm not quite familiar with using pi or the sin,cos,tan in equations. Especially the sin,cos,tan.

Find: $f(\frac{\pi}{6})$

If $f(x) = \frac{-5\cos(9x)}{2\sin(-x)}$

A few steps on how to do this with explanation would be greatly appreciated thanks in advance!

2. well, if you're good with degrees its fine, because pi=180 degrees. from there you can probably do it easily, either by plugging it into a calculator, or using exact trigonometric values.

$(-5cos(9*30))/2sin(30)$

Moderator editor: pi/6 radians = 30 degrees.