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Simplifying cos(2x) = -1cos(3x) Remove parenthesis around (2x) cos * 2x = -1cos(3x) Reorder the terms for easier multiplication: 2cos * x = -1cos(3x) Multiply cos * x 2cosx = -1cos(3x) Remove parenthesis around (3x) 2cosx = -1cos * 3x Reorder the terms for easier multiplication: 2cosx = -1 * 3cos * x Multiply -1 * 3 2cosx = -3cos * x Multiply cos * x 2cosx = -3cosx Solving 2cosx = -3cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3cosx' to each side of the equation. 2cosx + 3cosx = -3cosx + 3cosx Combine like terms: 2cosx + 3cosx = 5cosx 5cosx = -3cosx + 3cosx Combine like terms: -3cosx + 3cosx = 0 5cosx = 0 Divide each side by '5'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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