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5.29.9  Leading coefficient of a polynomial: lcoeff

lcoeff takes as argument a polynomial given by a symbolic expression or by the list of its coefficients.
lcoeff returns the leading coefficient of this polynomial, that is the coefficient of the monomial of highest degree.
Input:

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

Output:

2

Input:

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

Output:

3

Input:

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

Output:

5*x

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