Let $f ( x ) = \frac { \sin x } { 1 - \cos ^ { 2 } x }$

Multiple Choice

Let $f ( x ) = \frac { \sin x } { 1 - \cos ^ { 2 } x }$ Then $f ^ { \prime } ( x )$ is

A) $1 + \cot ^ { 2 } x$
B) $-CSCS .X$
C) $- \csc x \cot x$
D) $\csc x \cot x$
E) $\sec x \tan x$