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Simplifying 4cos(2x) + cos(x) = 0 Remove parenthesis around (2x) 4cos * 2x + cos(x) = 0 Reorder the terms for easier multiplication: 4 * 2cos * x + cos(x) = 0 Multiply 4 * 2 8cos * x + cos(x) = 0 Multiply cos * x 8cosx + cos(x) = 0 Multiply cos * x 8cosx + cosx = 0 Combine like terms: 8cosx + cosx = 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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