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Simplifying 5cos(2x) + 4cos(x) + -1 = 0 Remove parenthesis around (2x) 5cos * 2x + 4cos(x) + -1 = 0 Reorder the terms for easier multiplication: 5 * 2cos * x + 4cos(x) + -1 = 0 Multiply 5 * 2 10cos * x + 4cos(x) + -1 = 0 Multiply cos * x 10cosx + 4cos(x) + -1 = 0 Multiply cos * x 10cosx + 4cosx + -1 = 0 Reorder the terms: -1 + 10cosx + 4cosx = 0 Combine like terms: 10cosx + 4cosx = 14cosx -1 + 14cosx = 0 Solving -1 + 14cosx = 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 + 14cosx = 0 + 1 Combine like terms: -1 + 1 = 0 0 + 14cosx = 0 + 1 14cosx = 0 + 1 Combine like terms: 0 + 1 = 1 14cosx = 1 Divide each side by '14osx'. c = 0.07142857143o-1s-1x-1 Simplifying c = 0.07142857143o-1s-1x-1
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