### 5.27.7 Trailing coefficient degree of a polynomial : tcoeff

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

tcoeff returns the coefficient of the monomial of lowest degree
of this polynomial (tcoeff=trailing coefficient).

Input :

tcoeff([2,1,-1,0])

Output :

-1

Input :

tcoeff(3*x`^`

2+5*x,x)

Output :

5

Input :

tcoeff(3*x`^`

2+5*x*y`^`

2,y)

Output :

3*x`^`

2