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7 October, 12:48

Which of the following are identities? Check all that apply.

A) sin3x/sinx cosx = 4cosx - secx

B) sin6x = 2sin3x cos3x

C) sin3x-sinx/cosx+cosx = tanx

D) (sinx+cosx) ^2=1+sin2x

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Answers (1)
  1. 7 October, 15:41
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    They are all identies!
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