d / / 2\ \
--\(log\1 + t /, y)/
dy
$$\frac{\partial}{\partial y} \left( \log{\left(t^{2} + 1 \right)}, \ y\right)$$
2
d / / 2\ \
---\(log\1 + t /, y)/
2
dy
$$\frac{\partial^{2}}{\partial y^{2}} \left( \log{\left(t^{2} + 1 \right)}, \ y\right)$$
3
d / / 2\ \
---\(log\1 + t /, y)/
3
dy
$$\frac{\partial^{3}}{\partial y^{3}} \left( \log{\left(t^{2} + 1 \right)}, \ y\right)$$