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