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Simplifying cos(2x) + -3cosx = cosx Remove parenthesis around (2x) cos * 2x + -3cosx = cosx Reorder the terms for easier multiplication: 2cos * x + -3cosx = cosx Multiply cos * x 2cosx + -3cosx = cosx Combine like terms: 2cosx + -3cosx = -1cosx -1cosx = cosx Solving -1cosx = 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. -1cosx + -1cosx = cosx + -1cosx Combine like terms: -1cosx + -1cosx = -2cosx -2cosx = cosx + -1cosx Combine like terms: cosx + -1cosx = 0 -2cosx = 0 Divide each side by '-2'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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