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