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12 August, 10:26

How to solve cot x cos2x=2cot x

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Answers (2)
  1. 12 August, 12:16
    0
    Cotxcos2x = 2cotx

    cos2x = 2cotx/cotx

    cos2x = 2

    cos2x = 2cos²x - 1

    2cos²x - 1 = 2

    2cos²x = 2+1

    2cos²x = 3

    cos²x = 3/2

    √cos²x = plus minus √ (3/2)

    cosx = plus minus √ (3/2)
  2. 12 August, 12:34
    0
    Cot (x) cos (2x) = 2cot (x)

    cot (x) cot (x)

    cos (2x) = 2

    It is undefined.
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