Creat a procedure that descritises a given expression of f(x) or function f of one variable over a closed interval range [a,b] using N€ N points.
The output of the procedure should be a list containing the ordered pairs of points in the discretisation.
Add an argument to the procedure to allow for the optional display of the 2d plot of the specified domain comparing the original expression or function and its descritised  form with the points connected by straight lines. These should be displayed on the same plot.