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OpenStudy (anonymous):
Which of the following is an identity? a- tan^2x+cos^2x=1 b-(1-2sin^2x)csc^2x=4cos^2x-2 c-sinx-cosx+1=tanx d- sin^2xcot^2x+cos^2xtan^2x=1
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OpenStudy (anonymous):
simplify D's left hand side... you'll eventually end up with 1. or try starting from the right and end up with the left hand part of D.... now that's hard...:)
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