\[\frac{d}{dx}\left( \frac{1}{{{x}^{4}}\sec x} \right)=\]

1.	\[\frac{d}{dx}\left( \frac{1}{{{x}^{4}}\sec x} \right)=\]
A.	\[\frac{x\sin x+4\cos x}{{{x}^{5}}}\]
B.	\[\frac{-(x\sin x+4\cos x)}{{{x}^{5}}}\]
C.	\[\frac{4\cos x-x\sin x}{{{x}^{5}}}\]
D.	None of these
Answer» C. \[\frac{4\cos x-x\sin x}{{{x}^{5}}}\]

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\[\frac{d}{dx}\left( \frac{1}{{{x}^{4}}\sec x} \right)=\]

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