0
2 sin2(x) + sin(x) - 1 = 0
(2 sin + 1) (sin - 1) = 0
Either 2 sin(x) + 1 = 0
2sin(x) = -1
sin(x) = -0.5
x = 210°, 330°
or sin(x) - 1 = 0
sin(x) = 1
x = 90°
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