Problem:
Find the greatest common divisor of $-x^5+x^4-2 x^3+3 x^2+x-5$ and $-x^5+x^4-2 x^3+3 x^2+x-5$.
Answer:
$x^5-x^4+2 x^3-3 x^2-x+5$
{'source': 'AMPS', 'file': 'amps/mathematica/algebra/polynomial_gcd/7654.txt'}