Write the Trigonometric Expression as an Algebraic Expression in U $\tan \left( \csc ^ { - 1 } u \right)$

Write the trigonometric expression as an algebraic expression in u.
- $\tan \left( \csc ^ { - 1 } u \right)$

A) $\frac { 1 } { \sqrt { u ^ { 2 } - 1 } }$
B) $\frac { 1 } { \sqrt { \mathrm { u } ^ { 2 } + 1 } }$
C) $\sqrt { \mathrm { u } ^ { 2 } - 1 }$
D) $\frac { \sqrt { \mathrm { u } ^ { 2 } - 1 } } { \mathrm { u } }$

Correct Answer:

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