Evaluate
\frac{3}{hd^{2}}
Differentiate w.r.t. h
-\frac{3}{\left(dh\right)^{2}}
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\frac{h\times 3}{d^{2}h^{2}}
Divide \frac{h}{d^{2}} by \frac{h^{2}}{3} by multiplying \frac{h}{d^{2}} by the reciprocal of \frac{h^{2}}{3}.
\frac{3}{hd^{2}}
Cancel out h in both numerator and denominator.
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