Differentiable in a Cloed/Half Closed Interval OF is differentiable on an interval of the form [a,b],[a,+),(-0,b],la,b)of (a,b]if it is differentiable all points inside the interval and the appropriate one-sided derivative exists at each included endpoint. Differentiable in a Cloed/Half Closed Interval ⚫F is differentiable on an interval of the form [a,b], [a,+∞),(-∞,b],[a,b) of (a,b] if it is differentiable all points inside the interval and the appropriate one-sided derivative exists at each included endpoint