Write the Following as an Algebraic Expression in U, U $\tan \left( \cos ^ { - 1 } \frac { \mathrm { u } } { 3 } \right)$

Write the following as an algebraic expression in u, u > 0.
- $\tan \left( \cos ^ { - 1 } \frac { \mathrm { u } } { 3 } \right)$

A) $u ^ { 2 } \sqrt { 9 }$
B) $\frac { u \sqrt { 9 - u ^ { 2 } } } { 9 - u ^ { 2 } }$
C) $\frac { \sqrt { \mathrm { u } ^ { 2 } - 9 } } { \mathrm { u } }$
D) $\frac { \sqrt { 9 - u ^ { 2 } } } { u }$

Correct Answer:

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