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Simplifying cos(x) * cos(7x) + -1cos(3x) * cos(5x) = 0 Remove parenthesis around (7x) cos * x * cos * 7x + -1cos(3x) * cos(5x) = 0 Reorder the terms for easier multiplication: 7cos * x * cos * x + -1cos(3x) * cos(5x) = 0 Multiply cos * x 7cosx * cos * x + -1cos(3x) * cos(5x) = 0 Multiply cosx * cos 7c2o2s2x * x + -1cos(3x) * cos(5x) = 0 Multiply c2o2s2x * x 7c2o2s2x2 + -1cos(3x) * cos(5x) = 0 Remove parenthesis around (3x) 7c2o2s2x2 + -1cos * 3x * cos(5x) = 0 Remove parenthesis around (5x) 7c2o2s2x2 + -1cos * 3x * cos * 5x = 0 Reorder the terms for easier multiplication: 7c2o2s2x2 + -1 * 3 * 5cos * x * cos * x = 0 Multiply -1 * 3 7c2o2s2x2 + -3 * 5cos * x * cos * x = 0 Multiply -3 * 5 7c2o2s2x2 + -15cos * x * cos * x = 0 Multiply cos * x 7c2o2s2x2 + -15cosx * cos * x = 0 Multiply cosx * cos 7c2o2s2x2 + -15c2o2s2x * x = 0 Multiply c2o2s2x * x 7c2o2s2x2 + -15c2o2s2x2 = 0 Combine like terms: 7c2o2s2x2 + -15c2o2s2x2 = -8c2o2s2x2 -8c2o2s2x2 = 0 Solving -8c2o2s2x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '-8'. c2o2s2x2 = 0 Simplifying c2o2s2x2 = 0 The solution to this equation could not be determined.
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