Updates:
Status: Fixed
Comment #77 on issue 966 by smi...@gmail.com: extract minus sign issues
(from comment 46ff) was "Can't simplify exp(2 * pi * I * a) when a is
integer"
http://code.google.com/p/sympy/issues/detail?id=966
Perhaps this can be closed:
>>> a = Symbol("a", integer = True)
>>> exp(2*pi*I*a)
1
>>> (1-x-y).could_extract_minus_sign()
True
<the semantics of could_extract_minus_sign give True in this case because
there are an odd number of terms that a minus can be extracted from>
>>> from sympy.solvers.ode import _undetermined_coefficients_match
>>> _undetermined_coefficients_match(4*x*sin(x - 2), x)
{'test': True, 'trialset': set([x*cos(x - 2), x*sin(x - 2), cos(x - 2),
sin(x -
2)])}
>>> {'test': True, 'trialset': set([x*cos(x - 2), x*sin(x - 2), cos(x -
2),
... sin(x-2)])}
{'test': True, 'trialset': set([x*cos(x - 2), x*sin(x - 2), cos(x - 2),
sin(x -
2)])}
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