$\"\"$

\

The expression is $\"\"$ .

\

Consider $\"\"$ .

\

Rewrite the expression as $\"\"$ .

\

Write the above expression with common denominator.

\

$\"\"$

\

Apply reciprocal identity : $\"\"$ .

\

Pythagorean identity : $\"\"$ .

\

$\"\"$

\

Thus, $\"\"$ .

\

$\"\"$

\

$\"\"$ .