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Simplifying cos2(9x) + -1cos2(5x) = 0 Remove parenthesis around (9x) cos2 * 9x + -1cos2(5x) = 0 Reorder the terms for easier multiplication: 9cos2 * x + -1cos2(5x) = 0 Multiply cos2 * x 9cos2x + -1cos2(5x) = 0 Remove parenthesis around (5x) 9cos2x + -1cos2 * 5x = 0 Reorder the terms for easier multiplication: 9cos2x + -1 * 5cos2 * x = 0 Multiply -1 * 5 9cos2x + -5cos2 * x = 0 Multiply cos2 * x 9cos2x + -5cos2x = 0 Combine like terms: 9cos2x + -5cos2x = 4cos2x 4cos2x = 0 Solving 4cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '4'. cos2x = 0 Simplifying cos2x = 0 The solution to this equation could not be determined.
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