Comment #26 on issue 1337 by asmeurer: find all instances in an expression http://code.google.com/p/sympy/issues/detail?id=1337
Well, if subs is going to have an options manager as planned, then you could just make the replace feature an option to subs. But like I said, I also like having it separate, so either way would be fine to me.
For replace(sin(a), cos), I think we should make it replace(sin(a), cos(a)), where the a in the replace pattern is replaced with whatever the a was in the find pattern (like \1 in a regular expression). This should make it very powerful.
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