- #1

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2cos^{2}x - sin^{2}x = 2 - 3sin^{2}x

I tried using this identity to get it to work:

cos^{2}x - sin^{2}x = 1 - 2sin^{2}x

but alas, I could not. And after that I have no more ideas.

If someone could point out how this transforms that'd be great. Evil, evil trig...