# NCERT Solutions For Class 10 Maths Chapter 8 Introduction to Trigonometry Ex 8.4

Get Free NCERT Solutions for Class 10 Maths Chapter 8 Ex 8.4 Introduction to Trigonometry Class 10 Maths NCERT Solutions are extremely helpful while doing homework. Exercise 8.4 Class 10 Maths NCERT Solutions were prepared by Experienced ncert-books.in Teachers. Detailed answers of all the questions in Chapter 8 Maths Class 10 Coordinate Geometry Exercise 8.4 Provided in NCERT Textbook.NCERT Solutions For Class 10 Maths Chapter 8 Introduction to Trigonometry Ex 8.4

NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry Ex 8.4 are part of NCERT Solutions for Class 10 Maths. Here we have given NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry Ex 8.4.

Question 1.

Express the trigonometric ratios sin A, sec A and tan A in terms of cot A.

Solution:

Question 2.

Write all the other trigonometric ratios of ∠A in terms of sec A.

Solution:

Question 3.

Evaluate:

Solution:

Question 4.

Choose the correct option. Justify your choice.

(i) 9 sec² A – 9 tan² A = ……

(A) 1

(B) 9

(C) 8

(D) 0

(ii) (1 + tan θ + sec θ) (1 + cot θ – cosec θ) = ………..

(A) 0

(B) 1

(C) 2

(D) -1

(iii) (sec A + tan A) (1 – sin A) = ………….

(A) sec A

(B) sin A

(C) cosec A

(D) cos A

(iv) = ………..

(A) sec² A

(B) -1

(C) cot² A

(D) tan² A

Solution:

Question 5.

Prove the following identities, where the angles involved are acute angles for which the expressions are defined.

Solution: