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[" 12.Let "f:R rarr R" be defined by "f(...

[" 12.Let "f:R rarr R" be defined by "f(x)=ln(x+sqrt(x^(2)+1))" ,then number of solutions of "f^(-1)(x)],[[" (A) "1," (B) "2," (C) "3," (D) Infinite "]]

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