6. Find the exact area between curve y=1/x, x-axis and lines y=x and x=2 in first quadrant.
9. Find volume of solid formed when curve y=2/sqrt(2x-1) is rotated about x-axis from x=1 to x=5
10. Find area between curve y=lnx, y-axis and lines y=2 and y=4
11. Find exact volume of solid formed...