\[\frac{d}{dx}{{\cos }^{-1}}\frac{x-{{x}^{-1}}}{x+{{x}^{-1}}}\]= [DSSE 1985; Rookee 1963]

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

1.	\[\frac{d}{dx}{{\cos }^{-1}}\frac{x-{{x}^{-1}}}{x+{{x}^{-1}}}\]= [DSSE 1985; Rookee 1963]
A.	\[\frac{1}{1+{{x}^{2}}}\]
B.	\[\frac{-1}{1+{{x}^{2}}}\]
C.	\[\frac{2}{1+{{x}^{2}}}\]
D.	\[\]\[\frac{-2}{1+{{x}^{2}}}\]
Answer» E.

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\[\frac{d}{dx}{{\cos }^{-1}}\frac{x-{{x}^{-1}}}{x+{{x}^{-1}}}\]= [DSSE 1985; Rookee 1963]

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