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Simplifying cos2x + 2cosx + -2 = 0 Reorder the terms: -2 + 2cosx + cos2x = 0 Solving -2 + 2cosx + cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2cosx + 2 + cos2x = 0 + 2 Reorder the terms: -2 + 2 + 2cosx + cos2x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + 2cosx + cos2x = 0 + 2 2cosx + cos2x = 0 + 2 Combine like terms: 0 + 2 = 2 2cosx + cos2x = 2 Reorder the terms: -2 + 2cosx + cos2x = 2 + -2 Combine like terms: 2 + -2 = 0 -2 + 2cosx + cos2x = 0 The solution to this equation could not be determined.
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