Evaluate ∬Dxydxdy, where D is the region in the first quadrant bounded by curves xy=2,xy=4,y=x, and y=2x. (Hint: consider u=xy and v=y/x and use the change of variables obtained by expressing x and y in terms of u and v.)
a. 0
b.3
c.3ln2−1
d.3ln2
e.−3/2
