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Simplifying 9cos(2x) = -27cos(x) + -18 Remove parenthesis around (2x) 9cos * 2x = -27cos(x) + -18 Reorder the terms for easier multiplication: 9 * 2cos * x = -27cos(x) + -18 Multiply 9 * 2 18cos * x = -27cos(x) + -18 Multiply cos * x 18cosx = -27cos(x) + -18 Multiply cos * x 18cosx = -27cosx + -18 Reorder the terms: 18cosx = -18 + -27cosx Solving 18cosx = -18 + -27cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '27cosx' to each side of the equation. 18cosx + 27cosx = -18 + -27cosx + 27cosx Combine like terms: 18cosx + 27cosx = 45cosx 45cosx = -18 + -27cosx + 27cosx Combine like terms: -27cosx + 27cosx = 0 45cosx = -18 + 0 45cosx = -18 Divide each side by '45osx'. c = -0.4o-1s-1x-1 Simplifying c = -0.4o-1s-1x-1
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