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28 April, 01:11

1+cos (18x) =

A. 2cos^2 (9x)

B. 2sin^2 (9x)

C. 2cos^2 (18x)

D. 2sin^2 (18x)

+2
Answers (2)
  1. 28 April, 01:23
    0
    Answer: A

    Step-by-step explanation:

    1 + cos (18x) becomes

    1 + cos (9x + 9x)

    1 + cos² (9x) - sin² (9x)

    1 + cos² (9x) - (1 - cos² (9x))

    1 + cos² (9x) - 1 + cos² (9x)

    2 cos² (9x)
  2. 28 April, 01:40
    0
    Answer: a 2cos^2 (9x)
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