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Simplifying cos(2x) = -1cos(x) Remove parenthesis around (2x) cos * 2x = -1cos(x) Reorder the terms for easier multiplication: 2cos * x = -1cos(x) Multiply cos * x 2cosx = -1cos(x) Multiply cos * x 2cosx = -1cosx Solving 2cosx = -1cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add 'cosx' to each side of the equation. 2cosx + cosx = -1cosx + cosx Combine like terms: 2cosx + cosx = 3cosx 3cosx = -1cosx + cosx Combine like terms: -1cosx + cosx = 0 3cosx = 0 Divide each side by '3'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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