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Simplifying -1cosx + 9 = 3(1 + -1cos2x) Reorder the terms: 9 + -1cosx = 3(1 + -1cos2x) 9 + -1cosx = (1 * 3 + -1cos2x * 3) 9 + -1cosx = (3 + -3cos2x) Solving 9 + -1cosx = 3 + -3cos2x Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3cos2x' to each side of the equation. 9 + -1cosx + 3cos2x = 3 + -3cos2x + 3cos2x Combine like terms: -3cos2x + 3cos2x = 0 9 + -1cosx + 3cos2x = 3 + 0 9 + -1cosx + 3cos2x = 3 Add '-9' to each side of the equation. 9 + -1cosx + -9 + 3cos2x = 3 + -9 Reorder the terms: 9 + -9 + -1cosx + 3cos2x = 3 + -9 Combine like terms: 9 + -9 = 0 0 + -1cosx + 3cos2x = 3 + -9 -1cosx + 3cos2x = 3 + -9 Combine like terms: 3 + -9 = -6 -1cosx + 3cos2x = -6 Reorder the terms: 6 + -1cosx + 3cos2x = -6 + 6 Combine like terms: -6 + 6 = 0 6 + -1cosx + 3cos2x = 0 The solution to this equation could not be determined.
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