Find the Rate of Change of the Function $f ( x ) = - \csc x - \cos x$

Multiple Choice

Find the rate of change of the function $f ( x ) = - \csc x - \cos x$ . ​

A) ​ $\sin x + \sec x$
B) ​ $\sin x + 1$
C) ​ $\sin x - \tan x \sec x$
D) ​ $\sin x \sin x$
E) ​ $\csc x \cot x - \sin x$