Find all solutions to the equation.
$(\cos \theta +\sin \theta )(\cos \theta -\sin \theta )=-\frac{1}{2}$

$\(\theta\)=\(\frac{5\pi}{12}\)+2\(\pi\) n,\(\frac{7\pi}{12}\)+2\(\pi\) n$

$\(\theta\)=\(\frac{2\pi}{3}\)+2\(\pi\) n,\(\frac{4\pi}{3}\)+2\(\pi\) n$

$\(\theta\)=\(\frac{\pi}{3}\)+2\(\pi\) n,\(\frac{2\pi}{3}\)+2\(\pi\) n$

$\(\theta\)=\(\frac{\pi}{3}\)+\(\pi\) n,\(\frac{2\pi}{3}\)+\(\pi\) n$