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