$\"\"$

\

The equation is $\"\"$ .

\

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

\

$\"\"$

\

$\"\"$

\

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

\

(Apply Pythagorean identity: $\"\"$ )

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$ (Divide each side by negative 2) \ \

\

$\"\"$

\

$\"\"$ (Add 1 to each side) \ \

\

$\"\"$ (Take cube root of each side) \ \

\

$\"\"$

\

$\"\"$

\

The value is $\"\"$ . $\"\"$

\

The solution is $\"\"$ .