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Simplifying Cos(5x) + -1cos(9x) = 0 Remove parenthesis around (5x) osC * 5x + -1cos(9x) = 0 Reorder the terms for easier multiplication: 5osC * x + -1cos(9x) = 0 Multiply osC * x 5osxC + -1cos(9x) = 0 Remove parenthesis around (9x) 5osxC + -1cos * 9x = 0 Reorder the terms for easier multiplication: 5osxC + -1 * 9cos * x = 0 Multiply -1 * 9 5osxC + -9cos * x = 0 Multiply cos * x 5osxC + -9cosx = 0 Reorder the terms: -9cosx + 5osxC = 0 Solving -9cosx + 5osxC = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-5osxC' to each side of the equation. -9cosx + 5osxC + -5osxC = 0 + -5osxC Combine like terms: 5osxC + -5osxC = 0 -9cosx + 0 = 0 + -5osxC -9cosx = 0 + -5osxC Remove the zero: -9cosx = -5osxC Divide each side by '-9osx'. c = 0.5555555556C Simplifying c = 0.5555555556C
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