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I. फलन f(x)=tan^(-1)((2x)/(1-x^(2))),x=p...

`I`. फलन `f(x)=tan^(-1)((2x)/(1-x^(2))),x=pm1` पर अवकलनीय नहीं है ।
`II. tan^(-1)x` का मुख्य मान `[-(pi)/(2),(pi)/(2)]` है ।

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