d / u \
--|(- + 1, u)|
du\ u /
$$\frac{d}{d u} \left( 1 + \frac{u}{u}, \ u\right)$$
2
d / u \
---|(- + 1, u)|
2\ u /
du
$$\frac{d^{2}}{d u^{2}} \left( 1 + \frac{u}{u}, \ u\right)$$
3
d / u \
---|(- + 1, u)|
3\ u /
du
$$\frac{d^{3}}{d u^{3}} \left( 1 + \frac{u}{u}, \ u\right)$$