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Simplifying 2(cos(x) + cos(2x)) = 0 Multiply cos * x 2(cosx + cos(2x)) = 0 Remove parenthesis around (2x) 2(cosx + cos * 2x) = 0 Reorder the terms for easier multiplication: 2(cosx + 2cos * x) = 0 Multiply cos * x 2(cosx + 2cosx) = 0 Combine like terms: cosx + 2cosx = 3cosx 2(3cosx) = 0 Remove parenthesis around (3cosx) 2 * 3cosx = 0 Multiply 2 * 3 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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