Evaluate
\frac{7ba^{2}}{2}
Differentiate w.r.t. b
\frac{7a^{2}}{2}
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\frac{7}{2}aba
Divide 21ab by 6 to get \frac{7}{2}ab.
\frac{7}{2}a^{2}b
Multiply a and a to get a^{2}.
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