Xxy 29. for b er, define f(x, y) = x#0 then, at (0, 0), the function f is xy2 0 x =0. (a) continuous for b = 0 (b) continuous for b>0 (c) not differentiable for

xxy 29. For B eR, define f(x, y) = X#0 Then, at (0, 0), the function f is xy2 0 X =0. (a) continuous for B = 0 (b) continuous for B>0 (c) not differentiable for any B (d) continuous forB <0