python - How to do function composition in Sympy? -

i want h = f(g(x)) , able differentiate h, h.diff(x). 1 function h = cos(x) in fact possible , documentation makes clear.

but function compositions not clear. if have done this, kindly show me example or link me relevant document.

(if sympy can't this, know of other packages this, if non-python)

thank you.

it seems function composition works expect in sympy:

import sympy h = sympy.cos('x') g = sympy.sin(h) g out[245]: sin(cos(x)) 

or if prefer

from sympy.abc import x,y g = sympy.sin('y') f = g.subs({'y':h}) 

then can call diff derivative.

g.diff() out[246]: -sin(x)*cos(cos(x))