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Simplifying 2cos(9x) + -1 = 0 Remove parenthesis around (9x) 2cos * 9x + -1 = 0 Reorder the terms for easier multiplication: 2 * 9cos * x + -1 = 0 Multiply 2 * 9 18cos * x + -1 = 0 Multiply cos * x 18cosx + -1 = 0 Reorder the terms: -1 + 18cosx = 0 Solving -1 + 18cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 18cosx = 0 + 1 Combine like terms: -1 + 1 = 0 0 + 18cosx = 0 + 1 18cosx = 0 + 1 Combine like terms: 0 + 1 = 1 18cosx = 1 Divide each side by '18osx'. c = 0.05555555556o-1s-1x-1 Simplifying c = 0.05555555556o-1s-1x-1
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