The function is  .

Apply derivative with respect to x .

Apply the difference rule of derivatives.

The function does not have any critical numbers.

Find the maximum :

Substitute the left end point of the interval in .

Find the minimum :

Substitute the right end point of the interval in .

To find the absolute extreme of function in given region , sketch the function .

Left end point is minimum point over the interval .

Right end point is maximum point over the interval .

Minimum point is .

Maximum point is .