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Simplifying cos(3x) + 9cos(x) = 4 Remove parenthesis around (3x) cos * 3x + 9cos(x) = 4 Reorder the terms for easier multiplication: 3cos * x + 9cos(x) = 4 Multiply cos * x 3cosx + 9cos(x) = 4 Multiply cos * x 3cosx + 9cosx = 4 Combine like terms: 3cosx + 9cosx = 12cosx 12cosx = 4 Solving 12cosx = 4 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '12osx'. c = 0.3333333333o-1s-1x-1 Simplifying c = 0.3333333333o-1s-1x-1
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