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