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Simplifying x2 + -2x + -4cos(3x) = 0 Remove parenthesis around (3x) x2 + -2x + -4cos * 3x = 0 Reorder the terms for easier multiplication: x2 + -2x + -4 * 3cos * x = 0 Multiply -4 * 3 x2 + -2x + -12cos * x = 0 Multiply cos * x x2 + -2x + -12cosx = 0 Reorder the terms: -12cosx + -2x + x2 = 0 Solving -12cosx + -2x + x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2x' to each side of the equation. -12cosx + -2x + 2x + x2 = 0 + 2x Combine like terms: -2x + 2x = 0 -12cosx + 0 + x2 = 0 + 2x -12cosx + x2 = 0 + 2x Remove the zero: -12cosx + x2 = 2x Add '-1x2' to each side of the equation. -12cosx + x2 + -1x2 = 2x + -1x2 Combine like terms: x2 + -1x2 = 0 -12cosx + 0 = 2x + -1x2 -12cosx = 2x + -1x2 Divide each side by '-12osx'. c = -0.1666666667o-1s-1 + 0.08333333333o-1s-1x Simplifying c = -0.1666666667o-1s-1 + 0.08333333333o-1s-1x
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