Proven

I've proved what?

Sin 2X = 2Sin X Cos X?

cos 2X = 1 - 2sin^2 X?

Well, you think you guess right,

unfortunately, you thought wrong =P

I took the "How annoying are you?" test,

its in Facebook.

Guess what?

And the result is 82% !!!

Ouch! Slapped hard in the face....
Haha...