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OpenStudy (anonymous):
2+tan^2x-1/sec^2x
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OpenStudy (anonymous):
Are you looking for the answer or proof? Because I can give you the proof. It's: 2-sec^2x = 2 - (tan^2x + 1) = 1-tan^2x If your looking for the answer, I can't answer that. Sorry about that.
OpenStudy (anonymous):
ok its all good what about cos(x+y)cos(x-y) just simplify
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