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Simplifying cos(4x) = cos(2x) Remove parenthesis around (4x) cos * 4x = cos(2x) Reorder the terms for easier multiplication: 4cos * x = cos(2x) Multiply cos * x 4cosx = cos(2x) Remove parenthesis around (2x) 4cosx = cos * 2x Reorder the terms for easier multiplication: 4cosx = 2cos * x Multiply cos * x 4cosx = 2cosx Solving 4cosx = 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. 4cosx + -2cosx = 2cosx + -2cosx Combine like terms: 4cosx + -2cosx = 2cosx 2cosx = 2cosx + -2cosx Combine like terms: 2cosx + -2cosx = 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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