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Simplifying cos(5x) = 4x2 + -1 Remove parenthesis around (5x) cos * 5x = 4x2 + -1 Reorder the terms for easier multiplication: 5cos * x = 4x2 + -1 Multiply cos * x 5cosx = 4x2 + -1 Reorder the terms: 5cosx = -1 + 4x2 Solving 5cosx = -1 + 4x2 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '5osx'. c = -0.2o-1s-1x-1 + 0.8o-1s-1x Simplifying c = -0.2o-1s-1x-1 + 0.8o-1s-1x
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