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Simplifying 6cos(2x) = cos(12x) Remove parenthesis around (2x) 6cos * 2x = cos(12x) Reorder the terms for easier multiplication: 6 * 2cos * x = cos(12x) Multiply 6 * 2 12cos * x = cos(12x) Multiply cos * x 12cosx = cos(12x) Remove parenthesis around (12x) 12cosx = cos * 12x Reorder the terms for easier multiplication: 12cosx = 12cos * x Multiply cos * x 12cosx = 12cosx Add '-12cosx' to each side of the equation. 12cosx + -12cosx = 12cosx + -12cosx Combine like terms: 12cosx + -12cosx = 0 0 = 12cosx + -12cosx Combine like terms: 12cosx + -12cosx = 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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