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Simplifying 5cosx = cos(2x) + -4 Remove parenthesis around (2x) 5cosx = cos * 2x + -4 Reorder the terms for easier multiplication: 5cosx = 2cos * x + -4 Multiply cos * x 5cosx = 2cosx + -4 Reorder the terms: 5cosx = -4 + 2cosx Solving 5cosx = -4 + 2cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2cosx' to each side of the equation. 5cosx + -2cosx = -4 + 2cosx + -2cosx Combine like terms: 5cosx + -2cosx = 3cosx 3cosx = -4 + 2cosx + -2cosx Combine like terms: 2cosx + -2cosx = 0 3cosx = -4 + 0 3cosx = -4 Divide each side by '3osx'. c = -1.333333333o-1s-1x-1 Simplifying c = -1.333333333o-1s-1x-1
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