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Solve 2sin^2 x + sin x - 1 = 0 on [0, 2pi). (Ans: pi/6, 5pi/6, 3pi/2.)
Solve 2sin^2 x + sin x - 1 = 0 on [0, 2pi). (Ans: pi/6, 5pi/6, 3pi/2.)
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