# NCERT Class 12-Mathematics: Chapter –5 Continuity and Differentiability Part 13

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Question 23:

Show that is continuous but not differentiable at .

We have

For continuity at ,

Hence, is continuous at .

Now,

So, is not differentiable at .

Question 24:

A function satisfies the equation for all , . Suppose that the function is differentiable at and . Prove that .

Differentiate each of the following w.r.t. (Exercises 25 to 43):

Let satisfies the equation

Let is differentiable at and

Also,

Question 25:

Differentiate each of the following w.r.t.

Question 26:

Differentiate each of the following w.r.t. x

Question 27:

Question 28: