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Simplifying cos(4x) * cos(8x) + -1cos(5x) * cos(9x) = 0 Remove parenthesis around (4x) cos * 4x * cos(8x) + -1cos(5x) * cos(9x) = 0 Remove parenthesis around (8x) cos * 4x * cos * 8x + -1cos(5x) * cos(9x) = 0 Reorder the terms for easier multiplication: 4 * 8cos * x * cos * x + -1cos(5x) * cos(9x) = 0 Multiply 4 * 8 32cos * x * cos * x + -1cos(5x) * cos(9x) = 0 Multiply cos * x 32cosx * cos * x + -1cos(5x) * cos(9x) = 0 Multiply cosx * cos 32c2o2s2x * x + -1cos(5x) * cos(9x) = 0 Multiply c2o2s2x * x 32c2o2s2x2 + -1cos(5x) * cos(9x) = 0 Remove parenthesis around (5x) 32c2o2s2x2 + -1cos * 5x * cos(9x) = 0 Remove parenthesis around (9x) 32c2o2s2x2 + -1cos * 5x * cos * 9x = 0 Reorder the terms for easier multiplication: 32c2o2s2x2 + -1 * 5 * 9cos * x * cos * x = 0 Multiply -1 * 5 32c2o2s2x2 + -5 * 9cos * x * cos * x = 0 Multiply -5 * 9 32c2o2s2x2 + -45cos * x * cos * x = 0 Multiply cos * x 32c2o2s2x2 + -45cosx * cos * x = 0 Multiply cosx * cos 32c2o2s2x2 + -45c2o2s2x * x = 0 Multiply c2o2s2x * x 32c2o2s2x2 + -45c2o2s2x2 = 0 Combine like terms: 32c2o2s2x2 + -45c2o2s2x2 = -13c2o2s2x2 -13c2o2s2x2 = 0 Solving -13c2o2s2x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '-13'. c2o2s2x2 = 0 Simplifying c2o2s2x2 = 0 The solution to this equation could not be determined.
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