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Simplifying 4cos2x + 4cosx = -1 Reorder the terms: 4cosx + 4cos2x = -1 Solving 4cosx + 4cos2x = -1 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Reorder the terms: 1 + 4cosx + 4cos2x = -1 + 1 Combine like terms: -1 + 1 = 0 1 + 4cosx + 4cos2x = 0 The solution to this equation could not be determined.
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