$\"\"$

The trigonometric function is $\"\"$ .

Consider $\"\"$ .

Apply reciprocal identity : $\"\"$ .

$\"\"$

Apply even-odd identity : $\"\"$ .

$\"\"$

First find the value of $\"\"$ .

$\"\"$

Since the angle terminates in fourth quadrant, the sine function is negative.

$\"\"$

The value of trigonometric function : $\"\"$ .

$\"\"$

Thus, the exact value of $\"\"$ .

$\"\"$

The exact value of $\"\"$ .