dpsuperman411

Consider the function
f (x, y) = 25x2+ 25y2- 25xy + 25x - 25y that defined over the region {(x, y)|(x, y) ÎR 2,x > 0, y > 0}.
(i) Determine all the critical points of the function

(ii) Classify the critical points of the function

as a local minimum, local
maximum or a saddle point.

The man attempts to pull down the tree using the cable and small pulley arrangement 
shown. If the tension in AB is 60 N, determine the tension in cable CAD and the angle ɵ
which the cable makes at the pulley.