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