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(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

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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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1 Answer

  1. 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)

    ML Aggarwal Solutions for Class 10 Chapter 18 - 43

    = R.H.S.

    (ii)

    ML Aggarwal Solutions for Class 10 Chapter 18 - 44

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