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Simplifying cos(x + pi) + cos(x + -1pi) = 0 Reorder the terms: cos(ip + x) + cos(x + -1pi) = 0 (ip * cos + x * cos) + cos(x + -1pi) = 0 (ciops + cosx) + cos(x + -1pi) = 0 Reorder the terms: ciops + cosx + cos(-1ip + x) = 0 ciops + cosx + (-1ip * cos + x * cos) = 0 ciops + cosx + (-1ciops + cosx) = 0 Reorder the terms: ciops + -1ciops + cosx + cosx = 0 Combine like terms: ciops + -1ciops = 0 0 + cosx + cosx = 0 cosx + cosx = 0 Combine like terms: cosx + cosx = 2cosx 2cosx = 0 Solving 2cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '2'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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