Question

(d) Write a logarithmic function which is
differentiable only in the open interval (-1,1.)​

Answer 1

Answer:

At a point x, a function is differentiable if exists. For an interval it should exist at all points in the interval. If the second derivative is zero at point x, and at this point, the second derivative goes from negative to positive, is point x where it is decreasing the most?

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