Evaluate
\frac{7}{16ab^{2}}
Differentiate w.r.t. a
-\frac{7}{16\left(ab\right)^{2}}
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\frac{7}{16ab^{2}}
Since \frac{13}{16ab^{2}} and \frac{6}{16ab^{2}} have the same denominator, subtract them by subtracting their numerators. Subtract 6 from 13 to get 7.
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