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Simplifying cos(2x) = 2 + -3cosx Remove parenthesis around (2x) cos * 2x = 2 + -3cosx Reorder the terms for easier multiplication: 2cos * x = 2 + -3cosx Multiply cos * x 2cosx = 2 + -3cosx Solving 2cosx = 2 + -3cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3cosx' to each side of the equation. 2cosx + 3cosx = 2 + -3cosx + 3cosx Combine like terms: 2cosx + 3cosx = 5cosx 5cosx = 2 + -3cosx + 3cosx Combine like terms: -3cosx + 3cosx = 0 5cosx = 2 + 0 5cosx = 2 Divide each side by '5osx'. c = 0.4o-1s-1x-1 Simplifying c = 0.4o-1s-1x-1
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