Random polynomial : randpoly randPoly

### 2.24.23 Random polynomial : `randpoly randPoly`

`randpoly` (or `randPoly`) takes two arguments: the name of a variable (by default `x`) and an integer `n` (the order of the arguments is not important).
`randpoly` returns a polynomial with respect to the variable given argument (or `x` if none was provided), of degree the second argument, having as coefficients random integers evenly distributed on -99..+99.
Input :

`randpoly(t,4)`

Output for example:

`-8*t```^```4-87*t```^```3-52*t```^```2+94*t+80`

Input :

`randpoly(4)`

Output for example:

`70*x```^```4-46*x```^```3-7*x```^```2-24*x+52`

Input :

`randpoly(4,u)`

Output for example:

`2*u```^```4+33*u```^```3-6*u```^```2-92*u-12`