Trigonometry Help: Proving 1-cos@ / sin@ = tan(@/2)

[draotic]

Homework Statement

will sum1 prove this ...@=theta
1-cos@ / sin@ = tan(@/2)

Homework Equations

The Attempt at a Solution

i tried to do this
cos@ = cos^2(@/2) - sin^2 (@/2)
wat now?
...
thats doesn't get me anywhere

 

[Mentallic]

Since you have a half angle on the right side, you'll want to convert all angles into their half angle equivalents. For example, \sin(2x)=2\sin(x)\cos(x) therefore \sin(\theta)=2\sin\left(\frac{\theta}{2}\right) \cos \left(\frac{\theta}{2}\right)