Which of the following is an identity? A. secx tanx - cosx cotx = sinx B. (tanx + cotx) (sinx cosx) = 1 C. sin2x = 4 - 2cos2x D. cosx (2sinx + 1) = 0
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Home » Mathematics » Which of the following is an identity? A. secx tanx - cosx cotx = sinx B. (tanx + cotx) (sinx cosx) = 1 C. sin2x = 4 - 2cos2x D. cosx (2sinx + 1) = 0