Differentiate w.r.t. r
\frac{2}{3} = 0.6666666666666666
Evaluate
\frac{2r}{3}
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\frac{\mathrm{d}}{\mathrm{d}r}(\frac{2}{3}r)
Combine r and -\frac{r}{3} to get \frac{2}{3}r.
\frac{2}{3}r^{1-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{2}{3}r^{0}
Subtract 1 from 1.
\frac{2}{3}\times 1
For any term t except 0, t^{0}=1.
\frac{2}{3}
For any term t, t\times 1=t and 1t=t.
\frac{2}{3}r
Combine r and -\frac{r}{3} to get \frac{2}{3}r.
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