• 4 cos x = -1
    cos x = -1/4
    cos x = -0,25
    cos x = cos (180 - 75,5)
    cos x = cos 104,5°

    x = 104,5 + k.360
    k = 0, x = 104,5°

    x = -104,5 + k.360
    k = 1, x = 255,5°

    HP = {104,5° , 255,5°}

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