Problem:
Find the curl of the vector field $f(x,y,z)\uvec{i} + g(x,y,z)\uvec{j} + h(x,y,z)\uvec{k}$ where $f(x,y,z) = \tan (x)$, $g(x,y,z) = y$, and $h(x,y,z) = \tan ^{-1}(x z)$
from sympy import *
from sympy.vector import *

C = CoordSys3D('C')
x, y, z = C.x, C.y, C.z
f = tan(x)
g = y
h = y
print(curl(f * C.i + g * C.j + h * C.k))

