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[cos^(-1)(x^(2)-1)/(x^(2)+1)+tan^(-1)(2x...

[cos^(-1)(x^(2)-1)/(x^(2)+1)+tan^(-1)(2x)/(x^(2)-1)=(2 pi)/(3)" then "x=],[[" (A) "x=2-sqrt(3)," (B) "sqrt(3)," (C) "2+sqrt(3)," (D) None of these "]]

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