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1 October, 18:49

The expression cos 4xcos 3x + sin 4r sin 3x is

equivalent to

+3
Answers (1)
  1. 1 October, 19:11
    0
    Step-by-step explanation:

    cos 4x cos 3x + sin 4x sin 3x=cos (4x-3x) = cos x
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