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Simplifying 5cos2x + 13cosx + 8 = 0 Reorder the terms: 8 + 13cosx + 5cos2x = 0 Solving 8 + 13cosx + 5cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + 13cosx + -8 + 5cos2x = 0 + -8 Reorder the terms: 8 + -8 + 13cosx + 5cos2x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 13cosx + 5cos2x = 0 + -8 13cosx + 5cos2x = 0 + -8 Combine like terms: 0 + -8 = -8 13cosx + 5cos2x = -8 Reorder the terms: 8 + 13cosx + 5cos2x = -8 + 8 Combine like terms: -8 + 8 = 0 8 + 13cosx + 5cos2x = 0 The solution to this equation could not be determined.
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