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Simplifying 18 + 9cos(2x) + -27cos(x) = 0 Remove parenthesis around (2x) 18 + 9cos * 2x + -27cos(x) = 0 Reorder the terms for easier multiplication: 18 + 9 * 2cos * x + -27cos(x) = 0 Multiply 9 * 2 18 + 18cos * x + -27cos(x) = 0 Multiply cos * x 18 + 18cosx + -27cos(x) = 0 Multiply cos * x 18 + 18cosx + -27cosx = 0 Combine like terms: 18cosx + -27cosx = -9cosx 18 + -9cosx = 0 Solving 18 + -9cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -9cosx = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -9cosx = 0 + -18 -9cosx = 0 + -18 Combine like terms: 0 + -18 = -18 -9cosx = -18 Divide each side by '-9osx'. c = 2o-1s-1x-1 Simplifying c = 2o-1s-1x-1
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