33. let f(x, y) = y,x + y# then, x=y= 0 (a) r(xy) is continuous at origin (6) fx, y) is discontinuous at origin nas removable discontinuity at origin

33. Let f(X, y) = Y,x + y# Then, X=y= 0 (a) r(Xy) is continuous at origin (6) fx, y) is discontinuous at origin nas removable discontinuity at origin (d) (x, y) is not diffterentiabie at ofgn 4 Iet f ld