1. let a ax, y) = j. , *(0, 0) 0, (x, ) = (0, 0). then of of (a) anda exist at (0, 0) ox (b) {x, ) is continuous at (0, 0) c) ix, y) is differentiable at (0, 0)

1. Let A Ax, y) = J. , *(0, 0) 0, (x, ) = (0, 0). Then of of (A) anda exist at (0, 0) Ox (B) {x, ) is continuous at (0, 0) C) ix, y) is differentiable at (0, 0) (D) fx, y) is continuously differ- entiable at (0, 0)