Question 1 Suppose that x2 + 5y? = r + y. Then by using implicit differentiation, = equals (a) 2x + 10y - 1 (b) 1-2r 10y- 1 (c) 1-2r 1-2x 9y (d) 5y- (e) none of these Question 2 Let y = ear + sin(x2). Then dy equals (a) 5e'z + cos(x2) (b) est + 2x cos(x2) (c) esx + cos(x2 ) (d) 5ebr + 2x cos(x2) (e) none of these Question 3 Ify = 2, then = (a) 21n(r + 1) (b) 2y(Inx + 1) (c) 2x(x2x-1) (d) 2y(In x + x) (e) none of these Question 4 Ify = (1 + V1 +7x2)4. Then dy (a) 9 (b) 144 (c) 126 (d) 36 (e) none of these