3) 3.) (Ex. 2.1.26, 4pts) Describe the graph of the function f : R2 > R, f (x, y) = max(|:c|, |y|) by sketching some level sets. b) (Ex. 2.1.30, 3pts) Describe the surface in R3 of the equation 3:2 + y2 2x = 0. 4) Compute the following limits or show that they don't exist 3. Ex. 2.2.4.3.,4 ts lim 63 ) ( p )(z.y)-*(0,1) y