# How to read this code?

In sage, I performed the laplace transformation:

```
de=diff(y,t,2)-diff(y,x,2)==k*sin(pi*x);de.laplace(t,s)
```

and got such a code:

```
s^2L(y(x,t),t,s)-D[0](y)(x,t)2D[0,0]L(y(x,t),t,s)?sy(x,0)?D[0]L(y(x,t),t,s)D[0,0](y)(x,t)?D[1](y)(x,0)=sksin(?x)
```

Can someone tells me what `D[0](y)(x,t)2D[0,0]L(y(x,t),t,s)`

and `D[0]L(y(x,t),t,s)D[0,0](y)(x,t)`

mean?

Thanks!