Solve the equation for exact solutions over the interval [0, 2π). -2 cos²x = - - cos x - 1

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answerhappygod
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Solve the equation for exact solutions over the interval [0, 2π). -2 cos²x = - - cos x - 1

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Solve the equation for exact solutions over the interval [0, 2π). -2 cos²x = - - cos x - 1
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