$\"\"$

\

The integral is $\"\"$ .

\

Let $\"\"$ then $\"\"$ .

\

$\"\"$ .

\

Trignometric identity : $\"\"$ .

\

$\"\"$

\

Reciprocal identity : $\"\"$ .

\

$\"\"$ \ \

\

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

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .