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Simplifying cos(5x) = cos(4x) Remove parenthesis around (5x) cos * 5x = cos(4x) Reorder the terms for easier multiplication: 5cos * x = cos(4x) Multiply cos * x 5cosx = cos(4x) Remove parenthesis around (4x) 5cosx = cos * 4x Reorder the terms for easier multiplication: 5cosx = 4cos * x Multiply cos * x 5cosx = 4cosx Solving 5cosx = 4cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4cosx' to each side of the equation. 5cosx + -4cosx = 4cosx + -4cosx Combine like terms: 5cosx + -4cosx = 1cosx 1cosx = 4cosx + -4cosx Combine like terms: 4cosx + -4cosx = 0 1cosx = 0 Divide each side by '1'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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