\

The angle is $\"\"$ .

\

$\"\"$ ( since $\"\"$ )

\

$\"\"$ ( since $\"\"$ )

\

$\"\"$ .

\

Reciprocal identity : $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

\

$\"\"$ ( since $\"\"$ )

\

$\"\"$ ( since $\"\"$ )

\

$\"\"$ .

\

Reciprocal identity : $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

\

Quotient identity : $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

Reciprocal identity : $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

\

The exact values of $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , and $\"\"$ .