$\"\"$

\

The trigonometric function is $\"\"$ .

\

$\"\"$ (Write Pythagorean theorem)

\

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

\

$\"\"$ (Apply rule of exponents)

\

$\"\"$ (Subtract 25 from each side)

\

$\"\"$ (Apply square root each side)

\

The trigonometric function $\"\"$ . $\"\"$

\

$\"\"$ (Write trigonometric function)

\

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

\

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

\

$\"\"$ (Apply LCM rule: $\"\"$ )

\

$\"\"$ (Subtract: $\"\"$ )

\

$\"\"$ (Simplify)

\

The angle $\"\"$ lies in quadrant I, the function $\"\"$ is positive in quadrant II, so $\"\"$ . $\"\"$

\

$\"\"$ (Write trigonometric function)

\

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

\

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

\

$\"\"$ (Apply LCM rule: $\"\"$ )

\

$\"\"$ (Subtract: $\"\"$ )

\

$\"\"$ (Simplify)

\

The angle $\"\"$ lies in quadrant I, the function $\"\"$ is positive in quadrant II, so $\"\"$ . $\"\"$

\

$\"\"$ (Write trigonometric function)

\

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

\

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

\

$\"\"$ (Apply LCM rule: $\"\"$ )

\

$\"\"$ (Subtract: $\"\"$ )

\

$\"\"$ (Cancel common terms) $\"\"$

\

The solutions are $\"\"$ .