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