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Simplifying cos(2x) + cos(8x) = 0 Remove parenthesis around (2x) cos * 2x + cos(8x) = 0 Reorder the terms for easier multiplication: 2cos * x + cos(8x) = 0 Multiply cos * x 2cosx + cos(8x) = 0 Remove parenthesis around (8x) 2cosx + cos * 8x = 0 Reorder the terms for easier multiplication: 2cosx + 8cos * x = 0 Multiply cos * x 2cosx + 8cosx = 0 Combine like terms: 2cosx + 8cosx = 10cosx 10cosx = 0 Solving 10cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '10'. cosx = 0.0 Simplifying cosx = 0.0 The solution to this equation could not be determined.
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