Updates:
Status: Invalid
Comment #3 on issue 2231 by asmeurer: Matrix determinant properties are not
satisfied.
http://code.google.com/p/sympy/issues/detail?id=2231
Yes, the correct way to compare expressions is to canonize them with expand
or some other function. An even better way to test equality is to subtract
one from the other and see if you can reduce it to 0, like
simplify((B**2).det() - B.det()**2)
0
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