$\"\"$

Let t be a real number and let (x, y ) be the point on the unit circle corresponding to t, then $\"\"$ , and $\"\"$ .

$\"\"$

The point $\"\"$ .

$\"\"$ ,

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

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