Updates:
Status: Started
Comment #4 on issue 3773 by [email protected]: Rewriting acos to atan
produces an error for symbolic arguments
http://code.google.com/p/sympy/issues/detail?id=3773
Yes, the more correct way would be to return a Piecewise expression, or to
give a general answer that is valid for all complex arguments.
For the other thing, you don't have to open an issue for everything that
you plan to fix. Just open a pull request and fix everything. You should
separate them into separate commits, but that's it.
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