$\"\"$

The expression is $\"\"$ .

Let $\"\"$ , then $\"\"$ .

The length of the adjacent side is $\"\"$ .

The length of the hypotenuse is $\"\"$ .

Since the range of $\"\"$ and $\"\"$ are same, so take the value of $\"\"$ to find $\"\"$ .

Trigonometric ratio : $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

$\"\"$ .