Solving trig with half angle identity

[maddiestu]

Question:
2-2sin^2(x/2)=sin^2(x)
with the answer in radians

 

[Dr.Peterson]

Please tell us where you need help to solve this problem. Have you tried applying a half-angle identity? What went wrong? Or, if the problem itself doesn't tell you to use the half-angle identity, have you tried using a double-angle identity?

Once we see what you have tried, and what help you need, we'll be in a position to help you out.

You did read the submission guidelines, right?

 

[Paul Belino]

What do you want to do? Prove it or solve it?