- #1
Ai52487963
- 115
- 0
Anyone know if the difference of cos^2 and sin^2 is some obscure identity that no one's heard of?
Edit: nevermind. Shaum's tells me that cos^2 - sin^2 = cos(2a). GO SHAUMS!
Edit: nevermind. Shaum's tells me that cos^2 - sin^2 = cos(2a). GO SHAUMS!
Last edited: