$\"\"$

\

The value of the trigonometric function $\"\"$ and $\"\"$ .

\

Pythagorean identity : $\"\"$ .

\

$\"\"$

\

Since $\"\"$ , take $\"\"$ . $\"\"$

\

Quotient identity : $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

Reciprocal identity : $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

Reciprocal identity : $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

Reciprocal identity : $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

The remaining trigonometric functions are $\"\"$ , $\"\"$ , $\"\"$ ,

\

$\"\"$ and $\"\"$ .