Partial derivaative help

1. (A) (7 points) Let 2:3 - 23 f (x, y) = x 2 y + 2 xy? ' Please show the limit of f does not exist as (x, y) - (0, 0). (B) (8 points) Let sin(23 +y*) f ( x , y ) = r2 ty2 , (x, y) + (0,0), 0, (x, y) = (0, 0). Use the definition of the partial derivatives to find of(0, 0) and of (0, 0)