sympy/sympy — pull request #875 by smichr (2011-12-22 02:16:22+00:00)
Title: Cse returns list if iterable is given, otherwise Expr; TrigSimp references deleted

cse coerces all input into a returned list as the second argument. With this pull request, if you send in a Basic object, you get back a Basic object; a list is only used if you send in something else (e.g. list or set of objects).

While looking at this, I noticed that TrigSimp is no longer an appropriate reference, so I changed that, too.