The question is shown as the attachment. Could you help me?

Iu lectures and tutorials we shall SEE that ify : EEK-[(9, [1}] J~ R is given by my 32+y2 ' H'IL y} = then liu1 3(3, 3:} dues nut exist. {Isl-WED} Show, how-Fever, that g[.t.,y} approaches; g as {my} appmauhea [ELI-J} along any continuous curve 3; : It -i- R For which t!) = U and y'm] = u E IR. [15 pix}