$\"\"$

\

The trigonometric expression is $\"\"$ .

\

$\"\"$

\

$\"\"$

\

Remove the parentheses in the numerator.

\

Using formula: $\"\"$ .

\

$\"\"$

\

Apply Pythagorean identity: $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .