Plot the following function using the mesh command. Be sure to include a legend to depict the time and loop the plot for a few iterations. Set the facealpha value to $0\mathrm{.}75,$ choose an appropriate view, and visualize the plot over the ranges listed. Trig functions are in radians.

$z=\frac{cos(\frac{xt}{2})**sin(\frac{yt}{3})}{e^{\frac{t}{20}}}$

$0$