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Simplifying 13cos(2x) + -8 = -5 Remove parenthesis around (2x) 13cos * 2x + -8 = -5 Reorder the terms for easier multiplication: 13 * 2cos * x + -8 = -5 Multiply 13 * 2 26cos * x + -8 = -5 Multiply cos * x 26cosx + -8 = -5 Reorder the terms: -8 + 26cosx = -5 Solving -8 + 26cosx = -5 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 26cosx = -5 + 8 Combine like terms: -8 + 8 = 0 0 + 26cosx = -5 + 8 26cosx = -5 + 8 Combine like terms: -5 + 8 = 3 26cosx = 3 Divide each side by '26osx'. c = 0.1153846154o-1s-1x-1 Simplifying c = 0.1153846154o-1s-1x-1
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