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