Write the Given Expression as the Tangent of an Angle $$\frac { \tan 7 x + \tan 4 x } { 1 - \tan 7 x \tan 4 x }$$

Multiple Choice

Write the given expression as the tangent of an angle.​ $$\frac { \tan 7 x + \tan 4 x } { 1 - \tan 7 x \tan 4 x }$$

A) $\tan ( - 17 x )$
B) $\tan ( 11 x )$
C) $\tan ( 7 x )$
D) $\tan ( 3 x )$
E) $\tan ( 5 x )$