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Simplifying cos2x = 3(1 + -1cos2x) cos2x = (1 * 3 + -1cos2x * 3) cos2x = (3 + -3cos2x) Solving cos2x = 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. cos2x + 3cos2x = 3 + -3cos2x + 3cos2x Combine like terms: cos2x + 3cos2x = 4cos2x 4cos2x = 3 + -3cos2x + 3cos2x Combine like terms: -3cos2x + 3cos2x = 0 4cos2x = 3 + 0 4cos2x = 3 Divide each side by '4os2x'. c = 0.75o-1s-2x-1 Simplifying c = 0.75o-1s-2x-1
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