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Simplifying cos(2x) + cos(4x) = 0 Remove parenthesis around (2x) cos * 2x + cos(4x) = 0 Reorder the terms for easier multiplication: 2cos * x + cos(4x) = 0 Multiply cos * x 2cosx + cos(4x) = 0 Remove parenthesis around (4x) 2cosx + cos * 4x = 0 Reorder the terms for easier multiplication: 2cosx + 4cos * x = 0 Multiply cos * x 2cosx + 4cosx = 0 Combine like terms: 2cosx + 4cosx = 6cosx 6cosx = 0 Solving 6cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '6'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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