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Simplifying cos(-3x) = cos(2x) Remove parenthesis around (-3x) cos * -3x = cos(2x) Reorder the terms for easier multiplication: -3cos * x = cos(2x) Multiply cos * x -3cosx = cos(2x) Remove parenthesis around (2x) -3cosx = cos * 2x Reorder the terms for easier multiplication: -3cosx = 2cos * x Multiply cos * x -3cosx = 2cosx Solving -3cosx = 2cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2cosx' to each side of the equation. -3cosx + -2cosx = 2cosx + -2cosx Combine like terms: -3cosx + -2cosx = -5cosx -5cosx = 2cosx + -2cosx Combine like terms: 2cosx + -2cosx = 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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