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Simplifying -4cos(x) + 2 = cos(2x) Multiply cos * x -4cosx + 2 = cos(2x) Reorder the terms: 2 + -4cosx = cos(2x) Remove parenthesis around (2x) 2 + -4cosx = cos * 2x Reorder the terms for easier multiplication: 2 + -4cosx = 2cos * x Multiply cos * x 2 + -4cosx = 2cosx Solving 2 + -4cosx = 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. 2 + -4cosx + -2cosx = 2cosx + -2cosx Combine like terms: -4cosx + -2cosx = -6cosx 2 + -6cosx = 2cosx + -2cosx Combine like terms: 2cosx + -2cosx = 0 2 + -6cosx = 0 Add '-2' to each side of the equation. 2 + -2 + -6cosx = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -6cosx = 0 + -2 -6cosx = 0 + -2 Combine like terms: 0 + -2 = -2 -6cosx = -2 Divide each side by '-6osx'. c = 0.3333333333o-1s-1x-1 Simplifying c = 0.3333333333o-1s-1x-1
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