lot y$($x$,$ t$)$ for t $=2$ s over the range $\backslash$lambda $<=$ x $<=\backslash$lambda $.$ You may do the plot this by

hand but I encourage you to use a software package to create a $$nice$$ plot. If a suitable

software package doesn$$t spring to mind, consider downloading MATLAB and use this as

an opportunity to get familiar with it