I'm still new to sympy, so I might be doing something stupid, but I think
there's a problem here:
In [1]: from sympy import *
In [2]: x,y=symbols('x,y')
In [3]: cos(x+y).expand(trig=True)
Out[3]: -sin(x)*sin(y) + cos(x)*cos(y)
So far so good. but then:
In [4]: cos(x-y).expand(trig=True)
Leads to a long traceback that culminates with: AttributeError: 'Mul'
object has no attribute '_eval_expand_trig'
For giggles, I also tried:
In [5]: cos(x + (-y)).expand(trig=True)
Which fails in the same way. I can post the full traceback if it helps.
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