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Simplifying cos(2x) + -1cos(x) + -2 = 0 Remove parenthesis around (2x) cos * 2x + -1cos(x) + -2 = 0 Reorder the terms for easier multiplication: 2cos * x + -1cos(x) + -2 = 0 Multiply cos * x 2cosx + -1cos(x) + -2 = 0 Multiply cos * x 2cosx + -1cosx + -2 = 0 Reorder the terms: -2 + 2cosx + -1cosx = 0 Combine like terms: 2cosx + -1cosx = 1cosx -2 + 1cosx = 0 Solving -2 + 1cosx = 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 + 1cosx = 0 + 2 Combine like terms: -2 + 2 = 0 0 + 1cosx = 0 + 2 1cosx = 0 + 2 Combine like terms: 0 + 2 = 2 1cosx = 2 Divide each side by '1osx'. c = 2o-1s-1x-1 Simplifying c = 2o-1s-1x-1
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