Problem:
Find the jacobian of the vector valued function $\begin{pmatrix} f(x,y,z)\\ g(x,y,z) \\ h(x,y,z)\end{pmatrix}$ where $f(x,y,z) = y^2+z$, $g(x,y,z) = x^3$, and $h(x,y,z) = \cos (z)$
from sympy import *
from sympy.abc import x, y, z

f = y**2+z
g = x**3
h = cos(z)
X = Matrix([f, g, h]) 
print(X.jacobian((x, y, z)))
