1. Chapter 8 Class 10 Introduction to Trignometry
  2. Serial order wise
  3. Ex 8.3
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Ex 8.3, 3 (iii) [MCQ] - Chapter 8 Class 10 Introduction to Trignometry

Last updated at Dec. 16, 2024 by Teachoo

 

Transcript

Ex 8.3, 3 Choose the correct option. Justify your choice. (iii) (sec A + tan A) (1 – sin A) sec A (B) sin A (C) cosec A (D) cos A (sec A + tan A) (1 – sin A) = (𝟏/(𝒄𝒐𝒔 𝑨)+𝒔𝒊𝒏⁡𝑨/𝒄𝒐𝒔⁡〖 𝑨〗 ) (1 −sin⁡〖 𝐴)〗 = ((1 + sin⁡〖 𝐴)〗)/cos⁡〖 𝐴〗 ×(1 −sin⁡〖 𝐴)〗 = ((1 + sin⁡〖 𝐴)(1 −〖 sin〗⁡〖 𝐴)〗 〗)/cos⁡〖 𝐴〗 = ((1^2 −〖 sin2〗⁡〖 𝐴)〗)/cos⁡〖 𝐴〗 = ((𝟏 −〖 𝐬𝐢𝐧𝟐〗⁡〖 𝑨)〗)/cos⁡〖 𝐴〗 = (𝒄𝒐𝒔𝟐 𝑨)/cos⁡〖 𝐴〗 = cos A So, the correct answer is (d)
  1. Chapter 8 Class 10 Introduction to Trignometry
  2. Serial order wise

    3. Ex 8.3

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Examples →
Chapter 8 Class 10 Introduction to Trignometry
Serial order wise

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo