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Simplifying 3cos * 2x = 3cos * 2x Reorder the terms for easier multiplication: 3 * 2cos * x = 3cos * 2x Multiply 3 * 2 6cos * x = 3cos * 2x Multiply cos * x 6cosx = 3cos * 2x Reorder the terms for easier multiplication: 6cosx = 3 * 2cos * x Multiply 3 * 2 6cosx = 6cos * x Multiply cos * x 6cosx = 6cosx Add '-6cosx' to each side of the equation. 6cosx + -6cosx = 6cosx + -6cosx Combine like terms: 6cosx + -6cosx = 0 0 = 6cosx + -6cosx Combine like terms: 6cosx + -6cosx = 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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