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(i) (sec A + tan A) (1 – sin A) = cos A (ii) (1 + tan2 A) (1 – sin A) (1 + sin A) = 1

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This is an important question taken from the Book- ML Aggarwal
Board- ICSE
Publication- Avichal
Chapter- Trigonometric Identities
Chapter number-1

We have to prove that
(i) (sec A + tan A) (1 – sin A) = cos A

(ii) (1 + tan2 A) (1 – sin A) (1 + sin A) = 1

ML Aggarwal, Icse board, chapter 18, ques no 12

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1 Answer

  1. Solution:

    Given,

    (i) L.H.S = (sec A + tan A) (1 – sin A)

    ML Aggarwal Solutions for Class 10 Chapter 18 - 11

    (ii) L.H.S. = (1 + tan2 A) (1 – sin A) (1 + sin A)

    ML Aggarwal Solutions for Class 10 Chapter 18 - 12

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