Ex 8.3, 3 (iii) [MCQ] - Chapter 8 Class 10 Introduction to Trignometry

Last updated at Aug. 16, 2023 by Teachoo

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

Book a free demo

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)

Next: Ex 8.3, 3 (iv) [MCQ] → Ask a doubt

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

Class 6

Class 7

Class 8

Class 9

Class 10

Class 11

Class 12

Courses

Interesting

Popular