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[" 3."sec^(-1)[(x^(2)+1)/(x^(2)-1)]=?],[...

[" 3."sec^(-1)[(x^(2)+1)/(x^(2)-1)]=?],[[" (A) "2tan^(-1)x," (B) "2x^(2)," (C) "2cot^(-1)x]]

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