#!/usr/bin/python

# uses matplotlib 

from sympy import symbols, cos
from sympy.plotting import plot3d

x, y = symbols('x y')

plot3d(cos(x*3)*cos(y*5)-y)

#!/usr/bin/python

# uses matplotlib 

from sympy import symbols, cos
from sympy.plotting import plot3d

x, y = symbols('x y')

plot3d(cos(x*3)*cos(y*5)-y)

#!/usr/bin/python # uses matplotlib