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Simplifying -1cos(x) + -2cos(2x) = 0 Multiply cos * x -1cosx + -2cos(2x) = 0 Remove parenthesis around (2x) -1cosx + -2cos * 2x = 0 Reorder the terms for easier multiplication: -1cosx + -2 * 2cos * x = 0 Multiply -2 * 2 -1cosx + -4cos * x = 0 Multiply cos * x -1cosx + -4cosx = 0 Combine like terms: -1cosx + -4cosx = -5cosx -5cosx = 0 Solving -5cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '-5'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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