How would I do the following:
I have a generic function: d_1 = Function('d_1')(x)
that I apply to another function f in an expression such as y =
5*x_1**2+d_1(f).
Later I wish to substitute an explicit function such as
def D_1(f):
return(diff(f,x_1))
for d_1 and have y expanded after the substitution. For example if f =
x_1**2+x_2**2 then
y = 5*x_1**2+2*x_1
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