The function is  and the interval is .

Apply derivative on each side with respect to .

To find the critical numbers of , equate to zero.

or

or

or

or For

or

or .

is in the region .

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

Critical point is minimum point over the interval .

Right end point is maximum point over the interval ​.

Minimum point is .

Maximum point is .