create two vectors X and Y of values from (-pi) to pr with a spacing of pi/10. Define the vector Z as:
Z=(sin(sqrt(x^2+y^2)))/sqrt(x^2+y^2)
Plot Z function in 3d using either mesh or surf plot.
a.) plot with three different shading scheme (one plot per each shade)
b.) create another plot combination of surface plot and contour plot.
-you should end up with four different plots.
-all plots must be properly labeled