(i) (sin θ + cos θ) (sec θ + cosec θ) = 2 + sec θ cosec θ (ii) (cosec A – sin A) (sec A – cos A) sec2A = tan A

Question

deepaksoniGuru

Asked: March 16, 20212021-03-16T02:27:30+05:30 2021-03-16T02:27:30+05:30In: ICSE

This is an important question from the
Book- ML Aggarwal
Board- ICSE
Publication- Avichal
Chapter- Trigonometric Identities
Chapter number-18

We have to prove that equality

(i) (sin θ + cos θ) (sec θ + cosec θ) = 2 + sec θ cosec θ (ii) (cosec A – sin A) (sec A – cos A) sec2A = tan A

Trigonometric Identities, class 10th, chapter 18th, question no 28, ICSE board, ML aggarwal..

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AAREKH · Answer 1 · 2021-03-16T03:00:54+05:30

AAREKH Guru

Solution:

(i) (sin θ + cos θ) (sec θ + cosec θ) = 2 + sec θ cosec θ

L.H.S. = (sin θ + cos θ) (sec θ + cosec θ)

= R.H.S.

(ii)