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Simplifying cosx + -1 + -6cos(3x) = 0 Remove parenthesis around (3x) cosx + -1 + -6cos * 3x = 0 Reorder the terms for easier multiplication: cosx + -1 + -6 * 3cos * x = 0 Multiply -6 * 3 cosx + -1 + -18cos * x = 0 Multiply cos * x cosx + -1 + -18cosx = 0 Reorder the terms: -1 + cosx + -18cosx = 0 Combine like terms: cosx + -18cosx = -17cosx -1 + -17cosx = 0 Solving -1 + -17cosx = 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 + -17cosx = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -17cosx = 0 + 1 -17cosx = 0 + 1 Combine like terms: 0 + 1 = 1 -17cosx = 1 Divide each side by '-17osx'. c = -0.05882352941o-1s-1x-1 Simplifying c = -0.05882352941o-1s-1x-1
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