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[" If "f:[1,oo)rarr[2,oo)" is given by "f(x)=x+(1)/(x)" ,then "f^(-1)(x)],[" equal to "],[[" (a) "(x+sqrt(x^(2)-4))/(2)-(b)(x)/(1+x^(2))," (c) "(x-sqrt(x^(2)-4))/(2)" (d) "1+sqrt(x^(2)-4)]]

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