Let $f ( x ) = \frac { 1 - \tan x } { \sin x }$

Multiple Choice

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

A) $\csc x \cot x + \sec x \tan x$
B) $\csc x \cot x - \sec x \tan x$
C) $- \csc x \cot x + \sec x \tan x$
D) $- \csc x \cot x - \sec x \tan x$
E) $\csc x \tan x - \sec x \cot x$