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