# NCERT Class 11-Math՚s: Exemplar Chapter 3 Trigonometric Functions Part 7 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 18**:

The value of is

(A)

(B)

(C)

(D)

**Answer**:

Correct choice is (C) .

Indeed

**Question 19**:

The value of

(A)

(B)

(C)

(D)

**Answer**:

(D) is the correct answer. We have

Fill in the blank:

**Question 20**:

**Answer**:

Given that which can be rewritten as

Applying componendo and Dividendo; we get

Giving

State whether the following statement is True or False. Justify your answer

**Question 21**:

“The inequality holds for all real values of θ”

**Answer**:

True. Since and are positive real numbers, so A. M. (Arithmetic Mean) of these two numbers is greater or equal to their G. M. (Geometric Mean) and hence

Since,