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5.29.10  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

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