# NCERT Class 12-Mathematics: Exemplar Chapter –7 Integrals Part 4

Doorsteptutor material for IEO Class-7 is prepared by world's top subject experts: fully solved questions with step-by-step explanation- practice your way to success.

**Question 13:**

Find

**Answer:**

**Question 14:**

Find

**Answer:**

We have

Put

Therefore,

## Long Answer (L.A.)

**Question 14:**

Evaluate

**Answer:**

Let . Then

So

Comparing coefficients, we get

So

Therefore,

**Question 16:**

**Answer:**

Now

Put Therefore

Again,

Thus

**Question 17:**

Show that

**Answer:**

Thus, we get

Hence,