Critical values of f note this value will be used instead. F ' (x) in x, then f ' (x) make zero, also called a real number c that f ' (c) causes. Not that critical values for which are not mentioned in this form after the critical values. To find the minimum or maximum values of relative relations function y = f (x), hence the need to find the value of c that makes the crisis, f (c) = 0, then consider that before the point where x = c, then a break point that makes the value of f (x) is the number of positive change from the deleted or changed from positive to negative integers or not.
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