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Simplifying 0 = cos(9x) Remove parenthesis around (9x) 0 = cos * 9x Reorder the terms for easier multiplication: 0 = 9cos * x Multiply cos * x 0 = 9cosx Solving 0 = 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. 0 + -9cosx = 9cosx + -9cosx Remove the zero: -9cosx = 9cosx + -9cosx Combine like terms: 9cosx + -9cosx = 0 -9cosx = 0 Divide each side by '-9'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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