Question 4: Make a 3-D mesh plot of the function z= √√√x² + y² - cos(2R) , where R = in the domain -5 ≤x≤5 and -5≤ y ≤5 Question 5: Make a 3-D surface plot of the function z = cos(x)cos(√√x2+ y2)e-10.2x in the domain and y≤π. e0.2R -2π ≤ x ≤2π