Which of the Following Is Equal to Limit $\lim _ { x \rightarrow 0 } \frac { 1 - \cos ^ { 2 } x } { 5 x }$

Multiple Choice

Which of the following is equal to limit $\lim _ { x \rightarrow 0 } \frac { 1 - \cos ^ { 2 } x } { 5 x }$ ?

A) $- \frac { 1 } { 5 }$
B) 0
C) $\frac { 1 } { 5 }$
D) 1
E) Does not exist