Can someone show me how to use the half angle formula?

Thanks

Nov 20th 2006, 05:08 PM

ThePerfectHacker

Quote:

Originally Posted by qbkr21

Thanks

You have that,

So to get your value for you take the square root. CAREFUL, since there are two roots it can be negative or positive. How do you know? Simple, determine the quadrant of the angle and where it lies.