$\"\"$

The integral is $\"\"$ .

Find the integral by using completing the squares method.

$\"\"$

Substiute $\"\"$ and $\"\"$ .

$\"\"$

Trignometric identity : $\"\"$ .

$\"\"$

Apply the power reducing formula : $\"\"$ .

$\"\"$

If $\"\"$ , then $\"\"$ .

Substiute corresponding values in the expression.

$\"\"$

$\"\"$ .

$\"\"$

$\"\"$ .