Greatest common divisor of two polynomials.
与 .wl 参考的差异： `PolynomialGCD` is wrong for multivariate input
PolynomialGCD[poly1, poly2, …]
PolynomialGCD[poly1, poly2, …, Modulus -> p]
PolynomialGCD[x^2 - 1, x^2 + 2 x + 1]
→ 1 + x- Extension — default None
- Modulus — default 0
- Trig — default False