Which of the following is not an identity? A. cos^2 x cscx-cscx= -sinx B. csc^2x + sec^2x = 1 C. sinx(cotx + tanx) = secx D. cos^2x - sin^2x = 1- 2sin^2x

Which of the following is not an identity? A. cos^2 x cscx-cscx= -sinx B. csc^2x + sec^2x = 1 C. sinx(cotx + tanx) = secx D. cos^2x - sin^2x = 1- 2sin^2x

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