Write Each Expression in Factored Form as an Algebraic Expression $\cos x - \sin ^ { 2 } x - 1$

Multiple Choice

Write each expression in factored form as an algebraic expression of a single trigonometric function.
- $\cos x - \sin ^ { 2 } x - 1$

A) $( \cos x + 2 ) ( \cos x - 1 )$
B) $( \cot x + 1 ) ( \cot x - 1 )$
C) $\cos ^ { 2 } x = 1$
D) $\sin 2 x$