Comment #12 on issue 1525 by asmeurer: No integration by substitution
http://code.google.com/p/sympy/issues/detail?id=1525
Can you open a new issue for the Limit thing? We should maybe create some
kind of direction object, which would allow directional limits (like for
more than one dimension or for complex limits).
The correct answer should be (as given by Maple):
diff(f(2*x), x);
2
D(f)(2 x)
D is the differentiation operator. It means the first derivative of f
evaluated at 2*x. This is basically your unevaluated subs that you want,
except it is just for derivatives (but it's essentially the same thing).
But it's important to understand that without signifying in any way that u
is equal to 2*x, the result is wrong.
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