Step 1:

The equation is $\"\"$ .

Rewrite the above equation.

$\"\"$

Apply integral on each side.

$\"\"$

Apply the integration by parts: $\"\"$ .

Apply the power rule of integral : $\"\"$ .

$\"\"$

Step 2:

Apply the integral of trigonometric function : $\"\"$ .

$\"\"$

Apply the integral of trigonometric function : $\"\"$ .

$\"\"$

The value is $\"\"$ .

$\"\"$

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

$\"\"$

Solution :

$\"\"$