ocr: aw if w-e wsin 4 1 1. 6. - - a) Find ax 2 b) If u= F( (X,Y,Z) and z l E(X,Y); find ax 3u 2 7. a) Evaluate CU ax2yexyax - dy. b) Interchange the variables of integration of the integral in part (a). c) Find and classify the critical points of xPytxy? 2 +xy. f(x,y) =
