please help

Show your work/reasoning. Be neat and orderly. Solve on scratch paper first. Simplify answers. 1. For each function, (4 pts) write the domain of f using set-builder notation, and (12 pts) sketch the domain of f in the xy-plane. Label all curves and lines. Justify your sketch by evaluating a few test points. (a) f(x, y) = Vx-y2 1 - y 2 - NW 4 -3 -2 -10 -2 (b) f (x, y ) = cos (y-x) + 2 4 -3 -2 -1 0 3 -2 -3