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Simplifying 2cos(4x) + 1 = 0 Remove parenthesis around (4x) 2cos * 4x + 1 = 0 Reorder the terms for easier multiplication: 2 * 4cos * x + 1 = 0 Multiply 2 * 4 8cos * x + 1 = 0 Multiply cos * x 8cosx + 1 = 0 Reorder the terms: 1 + 8cosx = 0 Solving 1 + 8cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 8cosx = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 8cosx = 0 + -1 8cosx = 0 + -1 Combine like terms: 0 + -1 = -1 8cosx = -1 Divide each side by '8osx'. c = -0.125o-1s-1x-1 Simplifying c = -0.125o-1s-1x-1
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