The point is $\"\"$ is on the unit circle in Quardant $\"\"$ .

Since the point is on the unit circle $\"\"$ .

Find $\"\"$ - value.

Substitute $\"\"$ in the formula.

$\"\"$

Since $\"\"$ -coordinate must be negative in Quardant $\"\"$ .

Thus, $\"\"$

The value of $\"\"$ is $\"\"$