$\"\"$

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

$\"\"$

The point (x, y) = $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

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