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Simplifying cos(4x) * cos(7x) = 0 Remove parenthesis around (4x) cos * 4x * cos(7x) = 0 Remove parenthesis around (7x) cos * 4x * cos * 7x = 0 Reorder the terms for easier multiplication: 4 * 7cos * x * cos * x = 0 Multiply 4 * 7 28cos * x * cos * x = 0 Multiply cos * x 28cosx * cos * x = 0 Multiply cosx * cos 28c2o2s2x * x = 0 Multiply c2o2s2x * x 28c2o2s2x2 = 0 Solving 28c2o2s2x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '28'. c2o2s2x2 = 0 Simplifying c2o2s2x2 = 0 The solution to this equation could not be determined.
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