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Simplifying 3cos(2x) = -9cos(x) + -6 Remove parenthesis around (2x) 3cos * 2x = -9cos(x) + -6 Reorder the terms for easier multiplication: 3 * 2cos * x = -9cos(x) + -6 Multiply 3 * 2 6cos * x = -9cos(x) + -6 Multiply cos * x 6cosx = -9cos(x) + -6 Multiply cos * x 6cosx = -9cosx + -6 Reorder the terms: 6cosx = -6 + -9cosx Solving 6cosx = -6 + -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. 6cosx + 9cosx = -6 + -9cosx + 9cosx Combine like terms: 6cosx + 9cosx = 15cosx 15cosx = -6 + -9cosx + 9cosx Combine like terms: -9cosx + 9cosx = 0 15cosx = -6 + 0 15cosx = -6 Divide each side by '15osx'. c = -0.4o-1s-1x-1 Simplifying c = -0.4o-1s-1x-1
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