Calculus Alculus 8 . slope feild of dx dy = y 10. The function f( x, y ) = x3- 3 x ty3-3y has a critical point at (1, 1 ) . knowing that fxx ( x,y)= 6x, fyy ( x,y) = by and fxy (x,y)=o, classify the critical point a . Not enough info b. The point (1, 1 ) is a local maximum for f ( x , y ) C. The point ( 1, 1) is a loccel minimum for f ( x, y ) d. The point (1, 1) is a saddle point for f(x y)