(i) 1/ (1 + cos A) + 1/ (1 – cos A) = 2 cosec2 A (ii) 1/(sec A + tan A) + 1/(sec A – tan A) = 2 sec A

Question

deepaksoniGuru

Asked: March 15, 20212021-03-15T21:52:16+05:30 2021-03-15T21:52:16+05:30In: ICSE

This question has been taken form the

Book- ML Aggarwal
Board- ICSE
Publication- Avichal
Chapter- Trigonometric Identities
Chapter number-18

We have to prove that

(i) 1/ (1 + cos A) + 1/ (1 – cos A) = 2 cosec² A

(ii) 1/(sec A + tan A) + 1/(sec A – tan A) = 2 sec A

Class10th. Trigonometric Identities, ques nom 14

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AAREKH · Answer 1 · 2021-03-16T03:27:18+05:30

AAREKH Guru

Solution:

(i) L.H.S. = 1/ (1 + cos A) + 1/ (1 – cos A)

(ii)

ML Aggarwal Solutions for Class 10 Chapter 18 - 15