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QUESTION

Which of the following is an identity? A. csc^2x+cot^2x=1 B. (cscx + cotx)^2=1 C. sin^2x sec^2x + 1=tan^2x csc^2x D. sin^2x - cos^2x=1 I REALLY NEED the answer IMMEDIATELY!

Which of the following is an identity?

A. csc^2x+cot^2x=1

B. (cscx + cotx)^2=1

C. sin^2x sec^2x + 1=tan^2x csc^2x

D. sin^2x - cos^2x=1

I REALLY NEED the answer IMMEDIATELY!

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