# NCERT Class 11-Math's: Chapter –13 Limits and Derivatives Part 4

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**Question 17:**

Evaluate

**Answer:**

We have

**Question 18:**

Evaluate

**Answer:** We have

**Question 19:**

Find the derivative of , by first principle.

**Answer:**

We have

**Question 20:**

Find the derivative of by first principle.

**Answer:** By definition

**Question 21:**

Find the derivative of

**Answer:**

Let

Differentiating both sides with respects to , we get