Comment #15 on issue 2081 by [email protected]: Pow substitution introduces
wrong answers
http://code.google.com/p/sympy/issues/detail?id=2081
But t2 also support algebraic subs:
h[3] >>> exp(x**3).subs(x, Eq(x**2, y))
exp(y**(3/2))
Here, you are saying "replace x with the first solution of the Eq when
solved for x".
/c
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