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Simplifying cos(9x) + cos(7x) = 0 Remove parenthesis around (9x) cos * 9x + cos(7x) = 0 Reorder the terms for easier multiplication: 9cos * x + cos(7x) = 0 Multiply cos * x 9cosx + cos(7x) = 0 Remove parenthesis around (7x) 9cosx + cos * 7x = 0 Reorder the terms for easier multiplication: 9cosx + 7cos * x = 0 Multiply cos * x 9cosx + 7cosx = 0 Combine like terms: 9cosx + 7cosx = 16cosx 16cosx = 0 Solving 16cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '16'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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