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Simplifying 4cos(x) = 4cos(2x) Multiply cos * x 4cosx = 4cos(2x) Remove parenthesis around (2x) 4cosx = 4cos * 2x Reorder the terms for easier multiplication: 4cosx = 4 * 2cos * x Multiply 4 * 2 4cosx = 8cos * x Multiply cos * x 4cosx = 8cosx Solving 4cosx = 8cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-8cosx' to each side of the equation. 4cosx + -8cosx = 8cosx + -8cosx Combine like terms: 4cosx + -8cosx = -4cosx -4cosx = 8cosx + -8cosx Combine like terms: 8cosx + -8cosx = 0 -4cosx = 0 Divide each side by '-4'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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