`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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