Leading coefficient of a polynomial

The lcoeff command finds the leading coefficient of a polynomial; that is, the coefficient of the monomial of highest degree.

lcoeff takes one mandatory argument and one optional argument:
- P, a polynomial given by a symbolic expression or by its list of coefficients.
- Optionally, x, a variable name (by default x).
lcoeff(P ⟨,x⟩) returns the leading coefficient of P.

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

lcoeff(3*x^2+5*x,x)

lcoeff(3*x^2+5*x*y^2,y)

5 x