$\"\"$

\

The integral is $\"\"$ .

\

Rewrite the integral.

\

$\"\"$ .

\

Trigonometric identity: $\"\"$ .

\

$\"\"$

\

Integral of sine function: $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

. $\"\"$

\

$\"\"$ .