$\"\"$

The trigonometric expression is $\"\"$ .

You know that formula from exercises 97 is $\"\"$ , where $\"\"$ .

$\"\"$ (Write original expression)

$\"\"$ (Apply formula: $\"\"$ )

$\"\"$ (Rule of exponents)

$\"\"$ (Simplify)

$\"\"$ (Use calculator) $\"\"$

The solution is $\"\"$ .