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Simplifying cos(2x) + -3cos(x) + 2 = 0 Remove parenthesis around (2x) cos * 2x + -3cos(x) + 2 = 0 Reorder the terms for easier multiplication: 2cos * x + -3cos(x) + 2 = 0 Multiply cos * x 2cosx + -3cos(x) + 2 = 0 Multiply cos * x 2cosx + -3cosx + 2 = 0 Reorder the terms: 2 + 2cosx + -3cosx = 0 Combine like terms: 2cosx + -3cosx = -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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