QUESTION 1 Let f (x,y) = 4e"-> + 5In(x-y) +xy and find f (3.2) de + 6 42 + 11 O 0 6 QUESTION 2 3x + 2y2 Find f (2, - 1) for the function f (x,y) = Vy +5 O 4 0 2 0 5 /2 0 1 QUESTION 3 Find f (x.>) for f (x.y) =x4+ 2x3y4-6y2. 0 4 3+8x343 0 4 3.12y 0 8x3,3-12y 0 1 3+ 6x24 QUESTION 4 Find f (x.y) for the function f (x,y) =x*+ 23y4-6y2: O 4x 3 + 8x3 3- 12y 0 4x 3 + 6x 3 / 4 8x 3y 3 - 12y