$\"\"$

\

The equation is $\"\"$ .

\

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

\

$\"\"$

\

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

\

$\"\"$

\

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

\

$\"\"$ $\"\"$

\

$\"\"$

\

$\"\"$ (Multiply each side by 2)

\

$\"\"$

\

(Add $\"\"$ to each side)

\

$\"\"$

\

$\"\"$

\

$\"\"$ (Subtract 1 from each side)

\

$\"\"$

\

$\"\"$ $\"\"$

\

$\"\"$

\

$\"\"$ (Take out common factor)

\

$\"\"$ (Apply zero product property)

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

The values are

\

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

\

The solutions are

\

$\"\"$ .