factors has either a polynomial or a list of polynomials as
argument.
factors returns a list containing the factors of the polynomial
and their exponents.
Input :
^2+2*x+1)Output :
Input :
^4-2*x^2+1)Output :
Input :
^3-2*x^2+1,x^2-x])Output :
^2-x-1,1],[x,1,x-1,1]]Input :
^2,x^2-1])Output :