Updates:
Status: Fixed
Comment #7 on issue 597 by renato.c...@gmail.com: Unable to subsitute
derivatives
http://code.google.com/p/sympy/issues/detail?id=597
This works in master now after issue 1620 was fixed:
diff(f(x**3), x).subs(x**3, y)
2/3 ⎛d ⎞│
3⋅y ⋅⎜──(f(1))⎟│
⎝d1 ⎠│1=y
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