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Simplifying cos(2x + 10) + cos(2x + -10) = 0 Reorder the terms: cos(10 + 2x) + cos(2x + -10) = 0 (10 * cos + 2x * cos) + cos(2x + -10) = 0 (10cos + 2cosx) + cos(2x + -10) = 0 Reorder the terms: 10cos + 2cosx + cos(-10 + 2x) = 0 10cos + 2cosx + (-10 * cos + 2x * cos) = 0 10cos + 2cosx + (-10cos + 2cosx) = 0 Reorder the terms: 10cos + -10cos + 2cosx + 2cosx = 0 Combine like terms: 10cos + -10cos = 0 0 + 2cosx + 2cosx = 0 2cosx + 2cosx = 0 Combine like terms: 2cosx + 2cosx = 4cosx 4cosx = 0 Solving 4cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '4'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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