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Simplifying Cos2(3x) + -3cos(3x) + 2 = 0 Remove parenthesis around (3x) os2C * 3x + -3cos(3x) + 2 = 0 Reorder the terms for easier multiplication: 3os2C * x + -3cos(3x) + 2 = 0 Multiply os2C * x 3os2xC + -3cos(3x) + 2 = 0 Remove parenthesis around (3x) 3os2xC + -3cos * 3x + 2 = 0 Reorder the terms for easier multiplication: 3os2xC + -3 * 3cos * x + 2 = 0 Multiply -3 * 3 3os2xC + -9cos * x + 2 = 0 Multiply cos * x 3os2xC + -9cosx + 2 = 0 Reorder the terms: 2 + -9cosx + 3os2xC = 0 Solving 2 + -9cosx + 3os2xC = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -9cosx + -2 + 3os2xC = 0 + -2 Reorder the terms: 2 + -2 + -9cosx + 3os2xC = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -9cosx + 3os2xC = 0 + -2 -9cosx + 3os2xC = 0 + -2 Combine like terms: 0 + -2 = -2 -9cosx + 3os2xC = -2 Add '-3os2xC' to each side of the equation. -9cosx + 3os2xC + -3os2xC = -2 + -3os2xC Combine like terms: 3os2xC + -3os2xC = 0 -9cosx + 0 = -2 + -3os2xC -9cosx = -2 + -3os2xC Divide each side by '-9osx'. c = 0.2222222222o-1s-1x-1 + 0.3333333333sC Simplifying c = 0.2222222222o-1s-1x-1 + 0.3333333333sC
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