differentiation

Question: $\frac{d}{dx}{{\cos }^{-1}}\frac{x-{{x}^{-1}}}{x+{{x}^{-1}}}$=



1) $\frac{1}{1+{{x}^{2}}}$
2) $\frac{-1}{1+{{x}^{2}}}$
3) $\frac{2}{1+{{x}^{2}}}$
4) $\frac{-2}{1+{{x}^{2}}}$
Solution: Explanation: No Explanation
Differentiation by substitution Higher order derivatives

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