# NCERT Class 12-Mathematics: Chapter –5 Continuity and Differentiability Part 18

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**Question 59:**

If prove that

**Answer:**

Given:

Taking log on both the sides, we get

Or

On differentiating above with respect to , we get

Hence Proved

**Question 60:**

If , prove that

**Answer:**

Given:

Taking log on both the sides, we get

On differentiating both the sides with respect to , we get

Hence Proved

**Question 61:**

If show that

**Answer:**

Given:

Taking log both the sides, we get

differentiating both the sides, we get

Hence Proved