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11 March, 14:29

The values of x over the interval 0° < x < 180° for which cos (3x) = 1 are

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  1. 11 March, 14:43
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    Cos x = 1 for any multiple of 360°

    So cos 3x is 1 for any multiple of 120°

    In the interval 0° < x < 180°, only x=120° is a valid solution (not x=0°!)
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