NCERT Class 11-Math's: Chapter 3 Exemplar Trigonometric Functions Part 13

Get top class preparation for IMO Class-11 right from your home: fully solved questions with step-by-step explanation- practice your way to success.

Download PDF of This Page (Size: 155K)

Long Answer Type

Question 20:

If then prove that

Answer:

Given,

prove:

As, LHS

Using:

It involves terms so we need to calculate it first.

Similarly,

Using:

Thus,

Question 21:

If , then prove that

Answer:

Given,

To prove: .

Applying componendo – dividend, we get

From transformation formula, we know that –

Question 22:

Find the value of the expression

Answer:

Let,

We know that-

Developed by: