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Simplifying 4cos2x = 3 + -9cosx Solving 4cos2x = 3 + -9cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '9cosx' to each side of the equation. 9cosx + 4cos2x = 3 + -9cosx + 9cosx Combine like terms: -9cosx + 9cosx = 0 9cosx + 4cos2x = 3 + 0 9cosx + 4cos2x = 3 Reorder the terms: -3 + 9cosx + 4cos2x = 3 + -3 Combine like terms: 3 + -3 = 0 -3 + 9cosx + 4cos2x = 0 The solution to this equation could not be determined.
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