Differentiate $\sec ^ { 2 }$ (Cos X)
B) $\sec ^ { 2 }$

Multiple Choice

Differentiate.
-f(x) = tan(cos x)

A) -sin x $\sec ^ { 2 }$ (cos x)
B) $\sec ^ { 2 }$ (cos x)
C) tan(-sin x)
D) tan(cos x) sec(cos x)
E) none of these