differentiation

Question: $\frac{d}{{dx}}\left( {\frac{1}{{{x^4}\sec x}}} \right) = $

1) $\frac{{x\sin x + 4\cos x}}{{{x^5}}}$

2) $\frac{{ - (x\sin x + 4\cos x)}}{{{x^5}}}$

3) $\frac{{4\cos x - x\sin x}}{{{x^5}}}$

4) None of these

Solution:

Explanation: Explanation

standard-differentiation

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