Using a Sum or Difference Identity, Write the Following as an Expression

Using a sum or difference identity, write the following as an expression involving functions of x.
- $\tan ( x + \pi )$

A) $- \tan x$
B) $\frac { \tan x - \sqrt { 3 } } { 1 + \sqrt { 3 } \tan x }$
C) $\tan x$
D) $\frac { 1 + \sqrt { 3 } \tan x } { \sqrt { 3 } - \tan x }$

Correct Answer:

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