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BUILT-IN MATHEMATICA SYMBOL
PolynomialExtendedGCD
PolynomialExtendedGCD[poly1, poly2, x]
gives the extended GCD of 
and 
treated as univariate polynomials in x.
PolynomialExtendedGCD[poly1, poly2, x, Modulus->p]
gives the extended GCD over the integers mod prime p.
New in 6
