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Simplifying 2cos(x) = -2cos(2x) Multiply cos * x 2cosx = -2cos(2x) Remove parenthesis around (2x) 2cosx = -2cos * 2x Reorder the terms for easier multiplication: 2cosx = -2 * 2cos * x Multiply -2 * 2 2cosx = -4cos * x Multiply cos * x 2cosx = -4cosx Solving 2cosx = -4cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4cosx' to each side of the equation. 2cosx + 4cosx = -4cosx + 4cosx Combine like terms: 2cosx + 4cosx = 6cosx 6cosx = -4cosx + 4cosx Combine like terms: -4cosx + 4cosx = 0 6cosx = 0 Divide each side by '6'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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