Comment #2 on issue 2064 by [email protected]: terms_gcd(sqrt(4 + 4*x))
doesn't give 2*sqrt(1 + x)
http://code.google.com/p/sympy/issues/detail?id=2064
There is a version with a similar name that is expr-based that lives in
core.exprtools. I've modified that and made a more general factor_terms
function that now gives
>>> gcd_terms(sqrt(4+4*x))
2*sqrt(x + 1)
gcd_terms is meant to look for explicit factors (like `x` and `y` in `x*y`,
not hidden factors like `x + 1` in `x**2 - 1`); with modifications it now
recurses; with factor_terms, such a gcd is removed without expanding the
input expression for commutative and non-commutative expressions.
This work is in my `quick` branch.
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