Which of the following is differentiable in the interval `(1, 2)`?

Differentiability in an Interval

Which of the following functions is not differentiable at x=1?

Which of the following fiunction is not differentiable at x=1?

which of the following function is not differentiable x=1

Let f,g : [-1,2] to be continuous functions which are twice differentiable on the interval (-1,2). Let the values of f and g at the points and 2 be as given in the following table: In each of the intervals (-1,0) and (0, 2) the function (f-3g) never vanishes. Then the correct statements(s) is(are) :

The following functions are differentiable on (-1,2)