$\"\"$

\

The integral function is $\"\"$ .

\

Let $\"\"$ .

\

Apply derivative on each side with respect to $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

Let $\"\"$ .

\

Apply derivative on each side with respect to $\"\"$ .

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

Trignometric substitution $\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Double angle formula : $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Consider $\"\"$ .

\

For a right triangle, $\"\"$ and $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$ .

\

Substitute corresponding values in the equation $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ in above equation.

\

$\"\"$

\

Substitute $\"\"$ in above equation.

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .