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Simplifying cos(2x) + 3cos(x) + -1 = 0 Remove parenthesis around (2x) cos * 2x + 3cos(x) + -1 = 0 Reorder the terms for easier multiplication: 2cos * x + 3cos(x) + -1 = 0 Multiply cos * x 2cosx + 3cos(x) + -1 = 0 Multiply cos * x 2cosx + 3cosx + -1 = 0 Reorder the terms: -1 + 2cosx + 3cosx = 0 Combine like terms: 2cosx + 3cosx = 5cosx -1 + 5cosx = 0 Solving -1 + 5cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 5cosx = 0 + 1 Combine like terms: -1 + 1 = 0 0 + 5cosx = 0 + 1 5cosx = 0 + 1 Combine like terms: 0 + 1 = 1 5cosx = 1 Divide each side by '5osx'. c = 0.2o-1s-1x-1 Simplifying c = 0.2o-1s-1x-1
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