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[" 4.If "f:[1,oo)rarr[2,oo)" is given by...

[" 4.If "f:[1,oo)rarr[2,oo)" is given by "f(x)=x+(1)/(x)," then "f^(-1)(x)],[" equals "quad x^(2)+2001,1M)],[[" (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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