$\"\"$

The expression is $\"\"$ .

$\"\"$ (Apply pythagorean identity)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Evaluate power: $\"\"$ ) $\"\"$

$\"\"$ (Add: 1 + 1 = 2)

$\"\"$ (Take the square root of each side)

$\"\"$ (Simplify)

$\"\"$ is in the fourth quadrant, sec $\"\"$ is positive,

Therefore $\"\"$ . \ \ $\"\"$

The value of $\"\"$ .