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Simplifying cos(5x) + 4 = 0 Remove parenthesis around (5x) cos * 5x + 4 = 0 Reorder the terms for easier multiplication: 5cos * x + 4 = 0 Multiply cos * x 5cosx + 4 = 0 Reorder the terms: 4 + 5cosx = 0 Solving 4 + 5cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 5cosx = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 5cosx = 0 + -4 5cosx = 0 + -4 Combine like terms: 0 + -4 = -4 5cosx = -4 Divide each side by '5osx'. c = -0.8o-1s-1x-1 Simplifying c = -0.8o-1s-1x-1
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