Y= 2 x x 2 + 1 between x = 0 and x = 6 for n 1 = 6 and n 2=12. this means you will be doing two estimates for the area under the curve: one using 6 rectangles on the interval from x=0 to x=6 and a second computation using 12 rectangles on the interval from x=0 to x=12. find the exact ar