> I think we should make it so that cos(4*x + 6).replace(2*x + 3, u) works.
>
That would be nice. Also, Francesco's wildcard replacement looks buggy.
The `4*x` apparently matches twice, once for 4 and once for x:
In [1]: u = symbols('u')
In [2]: w = Wild('w')
In [3]: cos(4*x+6).replace(w*(2*x+3), u*w, map=True)
Out[3]:
⎛ ⎛ 2 ⎞ ⎞
⎜ ⎜ 4⋅u ⋅x 6⋅u ⎟ ⎧ 4⋅u 6⋅u u⋅x ⎫⎟
⎜cos⎜────────── + ───────⎟, ⎨4: ───────, 6: ───────, x: ───────⎬⎟
⎜ ⎜ 2 2⋅x + 3⎟ ⎩ 2⋅x + 3 2⋅x + 3 2⋅x + 3⎭⎟
⎝ ⎝(2⋅x + 3) ⎠ ⎠
This seems to contradict the documentation's claims that "changes made are
targeted only once" and "changes are not made twice". I thought maybe I
just misunderstood the `simultaneous` flag, but that makes things even
worse. Or am I misunderstanding that?
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