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Kashvi Rao
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Asked: 2020-10-30T03:25:18+00:00 In:

If sec 4A = cosec (A – 20°), where 4A is an acute angle, find the value of A.

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NCERT Solutions for Class 10 Maths Chapter 8
Important NCERT Questions
Introduction Trigonometry
NCERT Books for Session 2022-2023
CBSE Board and UP Board Others state Board
EXERCISE 8.3
Page No:189
Questions No:5

2020-2021cbsechapter 8class10introduction trigonometrymathematicsncert
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    2 Answers

    1. Best Answer

      Given that: sec 4A = cosec(A – 20°)
      ⇒ cosec(90° – 4A) = cosec(A – 20°) [∵ cosec(90°- θ) = sec θ]
      ⇒ 90°-4A = A – 20°
      ⇒ 90°+20° = 5A ⇒ 5A = 110° A = 22°
      Hence, A = 22°

      See this for better understanding😮👇

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    2. Get Hindi Medium and English Medium NCERT Solution for Class 10 Maths to download.
      Please follow the link to visit website for first and second term exams solutions.
      https://www.tiwariacademy.com/ncert-solutions/class-10/maths/chapter-8/

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