I messed up :(
suppose we have a function on the interval [0,3]
and we want to determine where the function is increasing and decreasing , and our critical numbers were 2 and 4
what I did it since 4 is not on the interval i put 0 and 3 and took numbers greater than 3 and smaller than 0 and between 0 and 3 :(
what is the correct way ?
should I put only 2 ?
if I did , the function would be increasing all the time , so there will be no absolute max , but there was an absolute max and min.

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check 0 2 and 3 as critical values

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