Which of the Following Is Equal To $\cos ^ { 2 } C - \sin ^ { 2 } C$

Multiple Choice

Which of the following is equal to: $\cos ^ { 2 } C - \sin ^ { 2 } C$

A) $1 - 2 \sin ^ { 2 } c$
B) $\tan C \sin C$
C) $2 - \sec C \csc C$
D) $\csc ^ { 2 } C \sec ^ { 2 } C$
E) $\frac { 1 - \cos ^ { 2 } C } { \cos C }$