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17 August, 15:44

To solve the equation 2sin (2x) = cosx, you should rewrite it as

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Answers (2)
  1. 17 August, 15:57
    0
    Since sin (2x) = 2sinx cosx

    2sin (2x) =

    4sinxcosx=cosx
  2. 17 August, 18:24
    0
    Sin (2x) = 2Sin (x) Cos (x)

    Then 2*2Sin (x) Cos (x) = Cos (x)

    the Cos (x) 's cancel leaving

    4Sin (x) = 1

    Sin (x) = 1/4

    Arcsin (1/4) = 14.48 degrees
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