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Simplifying cos(2x) + -9cos(x) + 5 = 0 Remove parenthesis around (2x) cos * 2x + -9cos(x) + 5 = 0 Reorder the terms for easier multiplication: 2cos * x + -9cos(x) + 5 = 0 Multiply cos * x 2cosx + -9cos(x) + 5 = 0 Multiply cos * x 2cosx + -9cosx + 5 = 0 Reorder the terms: 5 + 2cosx + -9cosx = 0 Combine like terms: 2cosx + -9cosx = -7cosx 5 + -7cosx = 0 Solving 5 + -7cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -7cosx = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -7cosx = 0 + -5 -7cosx = 0 + -5 Combine like terms: 0 + -5 = -5 -7cosx = -5 Divide each side by '-7osx'. c = 0.7142857143o-1s-1x-1 Simplifying c = 0.7142857143o-1s-1x-1
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