cos2x-sinx=o (0°<_×<_360)
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cos 2x - sin x = 0
cos 2x = sin x
sin ( 90 - 2x ) = sin x
90 - 2x = x
3x = 90
x = 30
cos 2x = sin x
sin ( 90 - 2x ) = sin x
90 - 2x = x
3x = 90
x = 30
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