\
The limit is and the interval is
.
Here and
.
Consider the number of subintervals as .
Width of the interval is
.
End points : .
.
Consider the sample points to be the right endpoints.
\Riemann sum is .
.
Compare above expression with Riemann sum.
\Therefore, .
Here .
.
\
.
From the part 2 of the fundamental theorem of calculus, .
Where is any anti derivative of
, that is a function such that
.
Anti derivative of the function is
.
\
.