\

The trigonometric equation is $\"\"$ .

\

Find the $\"\"$ .

\

Fundamental identities: $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ in above equation. \ \

\

$\"\"$

\

Subtract $\"\"$ from each side.

\

$\"\"$

\

Take minus one each side and simplify.

\

$\"\"$

\

Therefore, the value of $\"\"$