Step 1:

\

The integral is $\"\"$ .

\

$\"\"$

\

From trigonometric identity : $\"\"$ .

\

$\"\"$

\

Consider $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ and $\"\"$ in the integral.

\

$\"\"$

\

Step 2:

\

$\"\"$

\

Rewrite the expression.

\

$\"\"$

\

Assume $\"\"$

\

$\"\"$

\

Substitute $\"\"$ and $\"\"$ in above integral.

\

$\"\"$

\

Substitute $\"\"$ in $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ in $\"\"$ .

\

$\"\"$

\

Solution :

\

$\"\"$ .