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Simplifying 3cosx = 2(1 + -1cos2x) 3cosx = (1 * 2 + -1cos2x * 2) 3cosx = (2 + -2cos2x) Solving 3cosx = 2 + -2cos2x Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2cos2x' to each side of the equation. 3cosx + 2cos2x = 2 + -2cos2x + 2cos2x Combine like terms: -2cos2x + 2cos2x = 0 3cosx + 2cos2x = 2 + 0 3cosx + 2cos2x = 2 Reorder the terms: -2 + 3cosx + 2cos2x = 2 + -2 Combine like terms: 2 + -2 = 0 -2 + 3cosx + 2cos2x = 0 The solution to this equation could not be determined.
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