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Simplifying cos(x) = -1cos(2x) Multiply cos * x cosx = -1cos(2x) Remove parenthesis around (2x) cosx = -1cos * 2x Reorder the terms for easier multiplication: cosx = -1 * 2cos * x Multiply -1 * 2 cosx = -2cos * x Multiply cos * x cosx = -2cosx Solving cosx = -2cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2cosx' to each side of the equation. cosx + 2cosx = -2cosx + 2cosx Combine like terms: cosx + 2cosx = 3cosx 3cosx = -2cosx + 2cosx Combine like terms: -2cosx + 2cosx = 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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