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Simplifying cos(2x) = cos(5x) Remove parenthesis around (2x) cos * 2x = cos(5x) Reorder the terms for easier multiplication: 2cos * x = cos(5x) Multiply cos * x 2cosx = cos(5x) Remove parenthesis around (5x) 2cosx = cos * 5x Reorder the terms for easier multiplication: 2cosx = 5cos * x Multiply cos * x 2cosx = 5cosx Solving 2cosx = 5cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-5cosx' to each side of the equation. 2cosx + -5cosx = 5cosx + -5cosx Combine like terms: 2cosx + -5cosx = -3cosx -3cosx = 5cosx + -5cosx Combine like terms: 5cosx + -5cosx = 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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