Mathematics
bestie1102
16

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

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kylaeberhardt92

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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