Step 1:

\

The trigonometric identity is $\"\"$ .

\

Consider $\"\"$ .

\

Apply double angle formula: $\"\"$ .

\

$\"\"$

\

Apply co function formula: $\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

Solution:

\

$\"\"$ .

\

\

$\"\"$

\

\