$\"\"$

The trigonometric equation is $\"\"$ and $\"\"$ in QIV. \ \

Consider $\"\"$ .

Apply reciprocal identity : $\"\"$ .

$\"\"$

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

$\"\"$

$\"\"$ .

Since the desired angle in QIV, the secent and cosine function are positive and the reference angle of $\"\"$ . $\"\"$

The angle is $\"\"$ .