[Python] I'm getting a "mul object is not callable"-error

import sympy as sp
def taylorCoefficient(f, a, n):
x = sp.symbols("x")
coefficient = []
for i in range(0, n + 1):
afgeleide = sp.diff(f(x), x, n=n)
def f(x0): return afgeleide.subs(x, x0)
coefficient += f(a) / sp.factorial(n)
return coefficient


x = sp.symbols("x")
taylorCoefficient(x ** 2 * sp.sin(x / 2), 0, 3)


I'm getting a mul object is not callable, but why? (On line afgeleide=...)

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