Comment #8 on issue 2246 by [email protected]: Global directive to switch strict transformations
http://code.google.com/p/sympy/issues/detail?id=2246

The behavior of sole is really strange it solve

In [6]: eq=tan(f(x))-x-c

In [7]: solve(eq, f(x))
Out[7]: [atan(c + x)]

but have NotImplemented error on

In [8]: eq=atan(f(x))-x-c

In [9]: solve(eq, f(x))

So it uses nonstrict computations indeed while strict ones are omitted.

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