Complete the Identity $$\frac { \cos 4 x - \cos 8 x } { \cos 4 x + \cos 8 x } = \text { ? }$$

Multiple Choice

Complete the identity.
- $$\frac { \cos 4 x - \cos 8 x } { \cos 4 x + \cos 8 x } = \text { ? }$$

A) $\tan 2 x \tan 6 x$
B) $- \tan 6 x$
C) $\cot 6 x$
D) 0