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Simplifying cos(3x) + cos(6x) = 0 Remove parenthesis around (3x) cos * 3x + cos(6x) = 0 Reorder the terms for easier multiplication: 3cos * x + cos(6x) = 0 Multiply cos * x 3cosx + cos(6x) = 0 Remove parenthesis around (6x) 3cosx + cos * 6x = 0 Reorder the terms for easier multiplication: 3cosx + 6cos * x = 0 Multiply cos * x 3cosx + 6cosx = 0 Combine like terms: 3cosx + 6cosx = 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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