The function is
.
Apply first derivative on each side with respect to
.




Find the relative extrema, by equating
.


.
So the critical values are 
and
.
Substitute
in
.



.
The point is
.
Substitute
in
.



.
The point is
.
The relative extrema points are
and
.
Using second derivative test, determine the relative extrema.
\Apply second derivative on each side with respect to
.




| Point | \Sign of ![]() | \
Conclusion | \
![]() | \
\
| \
\
Relative maximum \ | \
![]() | \
\
| \
Relative minimum | \
The relative maximum is at
.
The relative minimum is at
.