Write an Algebraic Expression That Is Equivalent To $\tan ( \arccos 3 x )$

Multiple Choice

Write an algebraic expression that is equivalent to $\tan ( \arccos 3 x )$ .

A) $\frac { \sqrt { 1 - 9 x ^ { 2 } } } { 3 x }$
B) $\sqrt { 1 - 9 x ^ { 2 } }$
C) $\frac { \sqrt { 1 - 9 x ^ { 2 } } } { 1 - 9 x ^ { 2 } }$
D) $\frac { 1 } { 3 x }$
E) $3 x$