# NCERT Class 12-Mathematics: Chapter –5 Continuity and Differentiability Part 19

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**Question 62:**

If , prove that

**Answer:**

.

Hence Proved

**Question 63:**

If , prove that .

**Answer**

We have,

On putting and , we get

On differentiating both sides we get

Hence proved

**Question 64:**

If in terms of alone.

**Answer:**

Given:

On differentiating Eq. (i) with respect to x, we get

Now, again differentiating the above with respect to , we get