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Simplifying 2cos2x = 4cosx + -1 Reorder the terms: 2cos2x = -1 + 4cosx Solving 2cos2x = -1 + 4cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4cosx' to each side of the equation. -4cosx + 2cos2x = -1 + 4cosx + -4cosx Combine like terms: 4cosx + -4cosx = 0 -4cosx + 2cos2x = -1 + 0 -4cosx + 2cos2x = -1 Reorder the terms: 1 + -4cosx + 2cos2x = -1 + 1 Combine like terms: -1 + 1 = 0 1 + -4cosx + 2cos2x = 0 The solution to this equation could not be determined.
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