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Simplifying cos(2x) + -4cos(x) = 8 Remove parenthesis around (2x) cos * 2x + -4cos(x) = 8 Reorder the terms for easier multiplication: 2cos * x + -4cos(x) = 8 Multiply cos * x 2cosx + -4cos(x) = 8 Multiply cos * x 2cosx + -4cosx = 8 Combine like terms: 2cosx + -4cosx = -2cosx -2cosx = 8 Solving -2cosx = 8 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '-2osx'. c = -4o-1s-1x-1 Simplifying c = -4o-1s-1x-1
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