You are being asked to estimate:Originally Posted by roseh
using 4 equal sub-intervals of . These sub-intervals are:
As we are instructed to use left hand Riemann sums we will approximate the
function on each of these subintervals by its value at the left hand point of
the sub-interval, so:
where is the width of the intervals in this case
This may be compared with the result of doing the integral analytically, which
gives an area of .