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Simplifying 2cos2x + -4cosx + 5 = 0 Reorder the terms: 5 + -4cosx + 2cos2x = 0 Solving 5 + -4cosx + 2cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -4cosx + -5 + 2cos2x = 0 + -5 Reorder the terms: 5 + -5 + -4cosx + 2cos2x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4cosx + 2cos2x = 0 + -5 -4cosx + 2cos2x = 0 + -5 Combine like terms: 0 + -5 = -5 -4cosx + 2cos2x = -5 Reorder the terms: 5 + -4cosx + 2cos2x = -5 + 5 Combine like terms: -5 + 5 = 0 5 + -4cosx + 2cos2x = 0 The solution to this equation could not be determined.
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