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Simplifying cos(4x + -20) + cos(2x + 20) = 0 Reorder the terms: cos(-20 + 4x) + cos(2x + 20) = 0 (-20 * cos + 4x * cos) + cos(2x + 20) = 0 (-20cos + 4cosx) + cos(2x + 20) = 0 Reorder the terms: -20cos + 4cosx + cos(20 + 2x) = 0 -20cos + 4cosx + (20 * cos + 2x * cos) = 0 -20cos + 4cosx + (20cos + 2cosx) = 0 Reorder the terms: -20cos + 20cos + 4cosx + 2cosx = 0 Combine like terms: -20cos + 20cos = 0 0 + 4cosx + 2cosx = 0 4cosx + 2cosx = 0 Combine like terms: 4cosx + 2cosx = 6cosx 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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