Write the Following as an Algebraic Expression in U, U $\sin \left( \arctan \frac { \mathrm { u } } { \sqrt { 3 } } \right)$

Multiple Choice

Write the following as an algebraic expression in u, u > 0.
- $\sin \left( \arctan \frac { \mathrm { u } } { \sqrt { 3 } } \right)$

A) $\frac { u \sqrt { u ^ { 2 } - 3 } } { u ^ { 2 } - 3 }$

B) $\mathrm { u } \sqrt { \mathrm { u } ^ { 2 } + 3 }$

C) $\frac { \sqrt { u ^ { 2 } + 3 } } { u ^ { 2 } + 3 }$

D) $\frac { u \sqrt { u ^ { 2 } + 3 } } { u ^ { 2 } + 3 }$