Evaluate
\frac{\pi ab^{2}}{4}
Differentiate w.r.t. a
\frac{\pi b^{2}}{4}
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\frac{ab\pi }{4}b
Express \frac{ab}{4}\pi as a single fraction.
\frac{ab\pi b}{4}
Express \frac{ab\pi }{4}b as a single fraction.
\frac{ab^{2}\pi }{4}
Multiply b and b to get b^{2}.
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