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Simplifying 2cos(2x) + -15cos(x) + -2 = 0 Remove parenthesis around (2x) 2cos * 2x + -15cos(x) + -2 = 0 Reorder the terms for easier multiplication: 2 * 2cos * x + -15cos(x) + -2 = 0 Multiply 2 * 2 4cos * x + -15cos(x) + -2 = 0 Multiply cos * x 4cosx + -15cos(x) + -2 = 0 Multiply cos * x 4cosx + -15cosx + -2 = 0 Reorder the terms: -2 + 4cosx + -15cosx = 0 Combine like terms: 4cosx + -15cosx = -11cosx -2 + -11cosx = 0 Solving -2 + -11cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -11cosx = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -11cosx = 0 + 2 -11cosx = 0 + 2 Combine like terms: 0 + 2 = 2 -11cosx = 2 Divide each side by '-11osx'. c = -0.1818181818o-1s-1x-1 Simplifying c = -0.1818181818o-1s-1x-1
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