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  3. for sin 2x + cos x = 0, use a double-angle or half

For sin 2x + cos x = 0, use a double-angle or half-angle formula to...

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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 the equation in the interval [0, 2?).The answers arex1 =12x3 =x4 =

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