$\"\"$

Let $\"\"$ be a real number and $\"\"$ be the point on the unit circle corresponding to $\"\"$ , then $\"\"$ , and $\"\"$ .

The point is $\"\"$ .

$\"\"$ ,

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

The exact values of six trigonometric functions are $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , and $\"\"$ .