Comment #9 on issue 3479 by [email protected]: KroneckerDelta should
canonicalize
http://code.google.com/p/sympy/issues/detail?id=3479
That is also expected. tan(2) does not reduce to anything, so it remains
symbolically different from 1/cot(2).
Take a read of http://docs.sympy.org/dev/gotchas.html#double-equals-signs.
== tests structural equality in SymPy, not mathematical equality.
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