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Solve the equation cos3x=1^2 where x is radian

  • Math -

    cos 3x = 1
    we know cos 0 = 1 and also cos 2π=1
    so 3x = 0 or 3x = 2π

    x = 0 or x = 2π/3
    the period of cos 3x = 2π/3,
    so a general solution is

    x = 2πk/3, where k is an integer.

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