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Simplifying 5cos(9x) = 5 + -5cos(9x) Remove parenthesis around (9x) 5cos * 9x = 5 + -5cos(9x) Reorder the terms for easier multiplication: 5 * 9cos * x = 5 + -5cos(9x) Multiply 5 * 9 45cos * x = 5 + -5cos(9x) Multiply cos * x 45cosx = 5 + -5cos(9x) Remove parenthesis around (9x) 45cosx = 5 + -5cos * 9x Reorder the terms for easier multiplication: 45cosx = 5 + -5 * 9cos * x Multiply -5 * 9 45cosx = 5 + -45cos * x Multiply cos * x 45cosx = 5 + -45cosx Solving 45cosx = 5 + -45cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '45cosx' to each side of the equation. 45cosx + 45cosx = 5 + -45cosx + 45cosx Combine like terms: 45cosx + 45cosx = 90cosx 90cosx = 5 + -45cosx + 45cosx Combine like terms: -45cosx + 45cosx = 0 90cosx = 5 + 0 90cosx = 5 Divide each side by '90osx'. c = 0.05555555556o-1s-1x-1 Simplifying c = 0.05555555556o-1s-1x-1
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