Start by computing {{MATH_666}} Using the same technique as we used before, we find that {{MATH_667}} Now we'll attempt to use the second derivative test, {{MATH_668}} Hence we see that {{MATH_669}} has a local minimum at {{MATH_670}}, a local maximum at {{MATH_671}}, and a local minimum at {{MATH_672}}, see below for a plot of {{MATH_673}} and {{MATH_674}}: {{CMD_675}} {{ENV_676}} {{COMMENT_677}} {{COMMENT_678}} {{CMD_679}}