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If F :[1,oo)->[2,oo) is given by f(x)=x+...

If `F :[1,oo)->[2,oo)` is given by `f(x)=x+1/x ,t h e n \ f^(-1)(x)` equals ` \ \ ` (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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