Let $x = 2 \tan \theta$ $0 \leq \theta < \pi / 2$

Multiple Choice

Let $x = 2 \tan \theta$ , $0 \leq \theta < \pi / 2$ ) Simplify the expression. $\frac { 1 } { x ^ { 2 } \sqrt { 4 + x ^ { 2 } } }$

A) $8 \tan ^ { 3 } \theta$

B) $\frac { \cos ^ { 3 } \theta } { 8 \sin ^ { 2 } \theta }$

C) $\sec ^ { 3 } \theta$

D) $\frac { \cos ^ { 2 } \theta } { 4 \sin \theta }$

E) $\frac { 8 \cos \theta } { \sin ^ { 2 } \theta }$