$\"\"$

The equation is $\"\"$ .

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

$\"\"$

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

$\"\"$

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

$\"\"$

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

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

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

$\"\"$

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

$\"\"$

$\"\"$ , where k is any integer. $\"\"$

The solutions are $\"\"$ , where k is any integer.