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Simplifying 5cos2x + 12cosx + -9 = 0 Reorder the terms: -9 + 12cosx + 5cos2x = 0 Solving -9 + 12cosx + 5cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 12cosx + 9 + 5cos2x = 0 + 9 Reorder the terms: -9 + 9 + 12cosx + 5cos2x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 12cosx + 5cos2x = 0 + 9 12cosx + 5cos2x = 0 + 9 Combine like terms: 0 + 9 = 9 12cosx + 5cos2x = 9 Reorder the terms: -9 + 12cosx + 5cos2x = 9 + -9 Combine like terms: 9 + -9 = 0 -9 + 12cosx + 5cos2x = 0 The solution to this equation could not be determined.
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