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Simplifying Cos(3x) + cos(2x) = 0 Remove parenthesis around (3x) osC * 3x + cos(2x) = 0 Reorder the terms for easier multiplication: 3osC * x + cos(2x) = 0 Multiply osC * x 3osxC + cos(2x) = 0 Remove parenthesis around (2x) 3osxC + cos * 2x = 0 Reorder the terms for easier multiplication: 3osxC + 2cos * x = 0 Multiply cos * x 3osxC + 2cosx = 0 Reorder the terms: 2cosx + 3osxC = 0 Solving 2cosx + 3osxC = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-3osxC' to each side of the equation. 2cosx + 3osxC + -3osxC = 0 + -3osxC Combine like terms: 3osxC + -3osxC = 0 2cosx + 0 = 0 + -3osxC 2cosx = 0 + -3osxC Remove the zero: 2cosx = -3osxC Divide each side by '2osx'. c = -1.5C Simplifying c = -1.5C
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