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Simplifying cos(9x) = cos(11x) Remove parenthesis around (9x) cos * 9x = cos(11x) Reorder the terms for easier multiplication: 9cos * x = cos(11x) Multiply cos * x 9cosx = cos(11x) Remove parenthesis around (11x) 9cosx = cos * 11x Reorder the terms for easier multiplication: 9cosx = 11cos * x Multiply cos * x 9cosx = 11cosx Solving 9cosx = 11cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-11cosx' to each side of the equation. 9cosx + -11cosx = 11cosx + -11cosx Combine like terms: 9cosx + -11cosx = -2cosx -2cosx = 11cosx + -11cosx Combine like terms: 11cosx + -11cosx = 0 -2cosx = 0 Divide each side by '-2'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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