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`f(x) = x + 1/x, [0.2, 4]` Find the absolute maximum and minimum values of f on the given interval

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Given: `f(x)=x+(1/x),[0.2,4]`

Find the critical value(s) of the function by setting the first derivative equal to zero and solving for the x value(s).

`f'(x)=1-(1/x^2)=0`

`1=(1/x^2)`

`x^2=1`

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