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Simplifying cos(8x) = cos(8x) Remove parenthesis around (8x) cos * 8x = cos(8x) Reorder the terms for easier multiplication: 8cos * x = cos(8x) Multiply cos * x 8cosx = cos(8x) Remove parenthesis around (8x) 8cosx = cos * 8x Reorder the terms for easier multiplication: 8cosx = 8cos * x Multiply cos * x 8cosx = 8cosx Add '-8cosx' to each side of the equation. 8cosx + -8cosx = 8cosx + -8cosx Combine like terms: 8cosx + -8cosx = 0 0 = 8cosx + -8cosx Combine like terms: 8cosx + -8cosx = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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