$\"\"$

The expression is $\"\"$ .

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

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

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

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

Trigonometric ratio : $\"\"$ .

$\"\"$

$\"\"$ .

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$\"\"$ .