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Simplifying -1cos(x) + -1cos(-1x) = 0 Multiply cos * x -1cosx + -1cos(-1x) = 0 Remove parenthesis around (-1x) -1cosx + -1cos * -1x = 0 Reorder the terms for easier multiplication: -1cosx + -1 * -1cos * x = 0 Multiply -1 * -1 -1cosx + 1cos * x = 0 Multiply cos * x -1cosx + 1cosx = 0 Combine like terms: -1cosx + 1cosx = 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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