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Simplifying cos(2x + 20) = -0.5 Reorder the terms: cos(20 + 2x) = -0.5 (20 * cos + 2x * cos) = -0.5 (20cos + 2cosx) = -0.5 Solving 20cos + 2cosx = -0.5 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Reorder the terms: 0.5 + 20cos + 2cosx = -0.5 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.5 + 20cos + 2cosx = 0.0 The solution to this equation could not be determined.
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