### 5.27.10 GCD of the coefficients of a polynomial : content

content takes as argument a polynomial P given by
a symbolic expression or by the list of its coefficients.

content returns the content of P,
that is the GCD (greatest common divisor) of the coefficients of
P.

Input :

content(6*x`^`

2-3*x+9)

or:

content([6,-3,9],x))

Output :

3