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Simplifying 2cos2 + -13cos + 7 = 0 Reorder the terms: 7 + -13cos + 2cos2 = 0 Solving 7 + -13cos + 2cos2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -13cos + -7 + 2cos2 = 0 + -7 Reorder the terms: 7 + -7 + -13cos + 2cos2 = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -13cos + 2cos2 = 0 + -7 -13cos + 2cos2 = 0 + -7 Combine like terms: 0 + -7 = -7 -13cos + 2cos2 = -7 Reorder the terms: 7 + -13cos + 2cos2 = -7 + 7 Combine like terms: -7 + 7 = 0 7 + -13cos + 2cos2 = 0 The solution to this equation could not be determined.
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