$\"\"$

The integral is $\"\"$ .

From the trignometric subustitution, subustiute $\"\"$ and $\"\"$ .

$\"\"$

From the pythagorean identity : $\"\"$ .

$\"\"$

Substitute $\"\"$ .

$\"\"$

Subustiute $\"\"$ .

$\"\"$

Earlier we subustiuted $\"\"$ .

$\"\"$

$\"\"$ $\"\"$ .