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24 September, 21:05

1-cos (12x) =

A. 2sin^2 (6x)

B. 2cos^2 (6x)

C. 2cos^2 (12x)

D. 2sin^2 (12x)

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Answers (1)
  1. 24 September, 21:11
    0
    Cos (12x) = cos (6x+6x) = cos6xcos6x - sin6xsin6x = cos^2 (6x) - sin^2 (6x)

    1 - cos (12x) = 1 - (cos^2 (6x) - sin^2 (6x)) = sin^2 (6x) + cos^2 (6x) - cos^2 (6x) + sin^2 (6x) = 2sin^2 (6x)

    so choice A. is right sure
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