$\"\"$

The function is $\"\"$ .

Apply first derivative with respect to $\"\"$ .

$\"\"$

We find the relative extrema by equating $\"\"$ .

$\"\"$

Now, substitute $\"\"$ in $\"\"$ .

$\"\"$

Substitute $\"\"$ in $\"\"$ .

$\"\"$

Substitute $\"\"$ in $\"\"$ .

$\"\"$

The relative extrema points are $\"\"$ , $\"\"$ and $\"\"$ .

$\"\"$

Determine the relative extrema, using second derivative test.

$\"\"$

Apply first derivative with respect to $\"\"$ .

$\"\"$

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

So according to second derivative test the function has minimum point at $\"\"$ .

The function has maximum point at $\"\"$ and $\"\"$ .

$\"\"$

The relative minimum at $\"\"$ .

The function has maximum point at $\"\"$ and $\"\"$ .