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

If `f:[1,oo)to[2,oo)` is given by `f(x)=x+(1)/(x)`, then `f^(-1)(x)` equals :

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The correct Answer is:
`f^(-1)(x)=(x+sqrt(x^(2)-4))/2`
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