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11 August, 06:03

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. 11 August, 09:01
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    They are all identies!
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