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Simplifying cos(4x) + cos(7x) = 0 Remove parenthesis around (4x) cos * 4x + cos(7x) = 0 Reorder the terms for easier multiplication: 4cos * x + cos(7x) = 0 Multiply cos * x 4cosx + cos(7x) = 0 Remove parenthesis around (7x) 4cosx + cos * 7x = 0 Reorder the terms for easier multiplication: 4cosx + 7cos * x = 0 Multiply cos * x 4cosx + 7cosx = 0 Combine like terms: 4cosx + 7cosx = 11cosx 11cosx = 0 Solving 11cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '11'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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