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Simplifying cos(9x) + cos(6x) + cos(3x) = 0 Remove parenthesis around (9x) cos * 9x + cos(6x) + cos(3x) = 0 Reorder the terms for easier multiplication: 9cos * x + cos(6x) + cos(3x) = 0 Multiply cos * x 9cosx + cos(6x) + cos(3x) = 0 Remove parenthesis around (6x) 9cosx + cos * 6x + cos(3x) = 0 Reorder the terms for easier multiplication: 9cosx + 6cos * x + cos(3x) = 0 Multiply cos * x 9cosx + 6cosx + cos(3x) = 0 Remove parenthesis around (3x) 9cosx + 6cosx + cos * 3x = 0 Reorder the terms for easier multiplication: 9cosx + 6cosx + 3cos * x = 0 Multiply cos * x 9cosx + 6cosx + 3cosx = 0 Combine like terms: 9cosx + 6cosx = 15cosx 15cosx + 3cosx = 0 Combine like terms: 15cosx + 3cosx = 18cosx 18cosx = 0 Solving 18cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '18'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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