Comment #10 on issue 2246 by [email protected]: Global directive to switch
strict transformations
http://code.google.com/p/sympy/issues/detail?id=2246
The reason that solve(atan(x)-y, x) does not return [tan(y)] is because the
inverse is not defined for atan:
>>> tan(x).inverse()
atan
>>> atan(x).inverse()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'atan' object has no attribute 'inverse'
>>>
What is the reason not to define such inverses?
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