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`

(The entire section contains 99 words.)

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