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22 March, 13:51

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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Answers (1)
  1. 22 March, 15:43
    0
    it may be

    c
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