\[\frac{d}{dx}{{\cos }^{-1}}\sqrt{\cos x}=\]

1.	\[\frac{d}{dx}{{\cos }^{-1}}\sqrt{\cos x}=\]
A.	\[\frac{1}{2}\sqrt{1+\sec x}\]
B.	\[\sqrt{1+\sec x}\]
C.	\[-\frac{1}{2}\sqrt{1+\sec x}\]
D.	\[-\sqrt{1+\sec x}\]
Answer» B. \[\sqrt{1+\sec x}\]

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\[\frac{d}{dx}{{\cos }^{-1}}\sqrt{\cos x}=\]

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