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