, , 4 x2 y 1. Identify and Sketch the domain of f(:1':, y) = . $2+y2 13211- 2- Let 9% y) = (a) Sketch the level curves of g at levels 19 = 1, 2 on a common Cartesian plane. (b) Find gym(m7y) at any (any) E R2. 3:5 + ysin23: , 3- Let h($,y) = $4 + yg a If (13;:9) % (030)- 0, if (117:?!) = (030) (a) Show that h is discontinuous at (U, 0). (b) Evaluate hx(0,0)