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Simplifying cos(3x) = -1cos(x) Remove parenthesis around (3x) cos * 3x = -1cos(x) Reorder the terms for easier multiplication: 3cos * x = -1cos(x) Multiply cos * x 3cosx = -1cos(x) Multiply cos * x 3cosx = -1cosx Solving 3cosx = -1cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add 'cosx' to each side of the equation. 3cosx + cosx = -1cosx + cosx Combine like terms: 3cosx + cosx = 4cosx 4cosx = -1cosx + cosx Combine like terms: -1cosx + cosx = 0 4cosx = 0 Divide each side by '4'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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