For the 3 points (x), yJ ) given by (1/3, 3), (1/2, 2), (1, 1) give the representation (without developing and
'simplifying in x!) of the interpolation polynomial P2(x) expressed by
(a) Lagrange's interpolation formula;
(b) the first form of the barycentric interpolation formula;
(c) Newton's interpolation formula. Evaluate P2(3/4) = P2(0.75) the way you prefer.