The function f(x,y) =x3 +x2y+xy2+y3 6x6y+4 has stationary points at some of the following points, (x, y). In each case identify whether the point is stationary, and if so find out if it is a maximum, minimum or saddle point. 1. The point (0, 0) is 2. The point (1, 1) is 3. The point (1, 1) is 4. The point (, ) is 5. The point (V3, \\/) is