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Simplifying cos(5x) + cos(4x) = 0 Remove parenthesis around (5x) cos * 5x + cos(4x) = 0 Reorder the terms for easier multiplication: 5cos * x + cos(4x) = 0 Multiply cos * x 5cosx + cos(4x) = 0 Remove parenthesis around (4x) 5cosx + cos * 4x = 0 Reorder the terms for easier multiplication: 5cosx + 4cos * x = 0 Multiply cos * x 5cosx + 4cosx = 0 Combine like terms: 5cosx + 4cosx = 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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