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OpenStudy (anonymous):
cos^2x(1+tan^2x)=1 is this an identity? explain why
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OpenStudy (psymon):
Well, do you know this identity? \[\sin ^{2}x+\cos ^{2}x=1\]
OpenStudy (unklerhaukus):
tan=sin/cos tan^2=sin^2/cos^2
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