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For sin 2x + cos x = 0, use a double-angle or half-angle formula to simplify the equation and then find all solutions of

For sin 2x + cos x = 0, use a double-angle or half-angle formula to simplify the equation and then find all solutions of the equation in the interval [0, 2). The answers are x1 = 8 8 8 x3 = 4= and

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