Let $f ( x ) = \frac { 1 + \cos x } { \sin x }$

Multiple Choice

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

A) -tan x
B) cot x
C) -cot x - csc x
D) -csc x(cot x + csc x)
E) -csc x(cot x - csc x)