Updates:
Status: Fixed
Comment #3 on issue 2064 by smi...@gmail.com: terms_gcd(sqrt(4 + 4*x))
doesn't give 2*sqrt(1 + x)
http://code.google.com/p/sympy/issues/detail?id=2064
terms_gcd is meant to only deal with gcd on each term, not within terms.
The gcd_terms function does the job:
>>> gcd_terms(sqrt(4+4*x))
2*sqrt(x + 1)
This is part of master.
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