### 2.24.10 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 it’s 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`