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Evaluate
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Differentiate w.r.t. x
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\frac{8}{2xy}-\frac{9}{2xy}
Since \frac{11}{2xy} and \frac{3}{2xy} have the same denominator, subtract them by subtracting their numerators. Subtract 3 from 11 to get 8.
\frac{-1}{2xy}
Since \frac{8}{2xy} and \frac{9}{2xy} have the same denominator, subtract them by subtracting their numerators. Subtract 9 from 8 to get -1.