I'm trying apply the following substitution a(x) = c * b(x) into a'(x)
a = sympy.Function('a')
b = sympy.Function('b')
c = sympy.Symbol('c')
x = sympy.Symbol('x')
expression = sympy.Derivative(a(x),x)
expression = expression.subs(a(x),c*b(x))
print expression.simplify()
I was expecting to get
> c*Derivative(b(x), x)
>
> but got instead
> Derivative(c*b(x), x)
>
> Is there a way to move the coefficient c out of the derivative?
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