## EXERCISE 1.8

#### Page No 334:

#### Question 1:

#### Answer:

It is known that,

#### Question 2:

#### Answer:

It is known that,

#### Question 3:

#### Answer:

It is known that,

#### Question 4:

#### Answer:

It is known that,

From equations (2) and (3), we obtain

#### Question 5:

#### Answer:

It is known that,

#### Question 6:

#### Answer:

It is known that,