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cos 2x = -sinx
1-2sin²x = -sinx
2sin²x - sinx - 1 = 0
(2sinx +1)(sinx -1) = 0
sin x= -1/2
sinx = sin (180+30)
x = 210
x = (360-30)
x = 330
sinx = 1
sin x = sin 90
x = 90