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I'm trying to verify: (1 - cos2 x)(1 + cos2 x) = 2sin2 x -sin4 x.
I got this far: (1 - cos2 x)(1 + cos2 x) = sin2 x (1 + cos2 x)
Then, in my solutions manual, it somehow substituted (2 - sin2 x) for the (1 + cos2 x) above. Where the heck did they get that? Please help!! Tha...
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