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OpenStudy (anonymous):
Identities and proof help please (: Which of the following is NOT an identity A) 1+cos^2 x / sin^2 x =1 B) tan^2 x=sec^2 x-sin^2 x-cos^2 x C) (cosx+sinx)^2 = 1+2cosxsinx D) (tanx+cotx)^2= csc^2 x + sec^2 x
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