Use Fundamental Identities to Simplify the Expression Below and Then $\sin \left( \frac { \pi } { 2 } - x \right) \csc x$

Multiple Choice

Use fundamental identities to simplify the expression below and then determine which of the following is not equivalent.​ $\sin \left( \frac { \pi } { 2 } - x \right) \csc x$ ​

A) ​-1
B) ​ $\frac { \cos x } { \sin x }$
C) ​cot x
D) ​1/ tan x
E) ​cos x csc x