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Solve 2sin^2 x - sin x - 1 = 0 on [0, 2pi). (Ans: pi/2, 7pi/6, 11pi/6.)
Solve 2sin^2 x - sin x - 1 = 0 on [0, 2pi). (Ans: pi/2, 7pi/6, 11pi/6.)
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