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Simplifying 3cos2x + -7cos2x + 2 = 0 Reorder the terms: 2 + 3cos2x + -7cos2x = 0 Combine like terms: 3cos2x + -7cos2x = -4cos2x 2 + -4cos2x = 0 Solving 2 + -4cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -4cos2x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -4cos2x = 0 + -2 -4cos2x = 0 + -2 Combine like terms: 0 + -2 = -2 -4cos2x = -2 Divide each side by '-4os2x'. c = 0.5o-1s-2x-1 Simplifying c = 0.5o-1s-2x-1
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