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OpenStudy (anonymous):
Which of the following is an identity? a. sinx - cosx + 1 = tanx b. (1 - 2sin2x)csc2x = 4cos2x - 2 c. sin2x cot2x + cos2x tan2x = 1 d. tan2x + cot2x = 1 Which of the following is not an identity? a. tan2x = sec2x - sin2x - cos2x b. 1+cos^2 x/ sin^2 x=1 c. (cosx + sinx)2 = 1 + 2cosx sinx d. (tanx + cotx)2 = csc2 x + sec2 x
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