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Simplifying (2cos2x + -1) + 5cosx + 3 = 0 Reorder the terms: (-1 + 2cos2x) + 5cosx + 3 = 0 Remove parenthesis around (-1 + 2cos2x) -1 + 2cos2x + 5cosx + 3 = 0 Reorder the terms: -1 + 3 + 5cosx + 2cos2x = 0 Combine like terms: -1 + 3 = 2 2 + 5cosx + 2cos2x = 0 Solving 2 + 5cosx + 2cos2x = 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 + 5cosx + -2 + 2cos2x = 0 + -2 Reorder the terms: 2 + -2 + 5cosx + 2cos2x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 5cosx + 2cos2x = 0 + -2 5cosx + 2cos2x = 0 + -2 Combine like terms: 0 + -2 = -2 5cosx + 2cos2x = -2 Reorder the terms: 2 + 5cosx + 2cos2x = -2 + 2 Combine like terms: -2 + 2 = 0 2 + 5cosx + 2cos2x = 0 The solution to this equation could not be determined.
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