from mpl_toolkits import mplot3d
import matplotlib.pyplot as plt
import math
import numpy as np
def z_func(x,y):
    return np.exp(np.cos(x**2+y**2))
x=np.linspace(-2*math.pi,2*math.pi,30)
y=np.linspace(-2*math.pi,2*math.pi,30)
Z=z_func(X,Y)
X,Y=np.meshgrid(x,y)
ax=plt.axes(projection='3d')
fig=plt.figure(figsize=(10,8))
ax.plot_surface(X,Y,Z)
ax.view_init(45,45)
ax.set_title("September2016 Q3(b)")