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Simplifying 9cos(2x) = -9cosx Remove parenthesis around (2x) 9cos * 2x = -9cosx Reorder the terms for easier multiplication: 9 * 2cos * x = -9cosx Multiply 9 * 2 18cos * x = -9cosx Multiply cos * x 18cosx = -9cosx Solving 18cosx = -9cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '9cosx' to each side of the equation. 18cosx + 9cosx = -9cosx + 9cosx Combine like terms: 18cosx + 9cosx = 27cosx 27cosx = -9cosx + 9cosx Combine like terms: -9cosx + 9cosx = 0 27cosx = 0 Divide each side by '27'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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