Example 4 - Chapter 8 Class 10 Introduction to Trignometry (Term 1)
Last updated at May 29, 2018 by Teachoo
Transcript
Example 4 In a right triangle ABC, right-angled at B, if tan A = 1, then verify that 2 sin A cos A = 1. Finding AC by pythagoras theorem (Hypotenuse)2 = (Height)2 + (Base)2 AC2 = AB2 + BC2 Putting AB = BC = k AC2 = k2 + k2 AC2 = 2k2 AC = โ2๐2 AC = k โ2 We have to find 2 sin A cos A Substituting the value of sin A and cos A = 2 ร1/โ2ร1/โ2 = 2/(โ2 ร โ2) = 2/(โ2 )^2 = 2/2 = 1
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Example 6 Important
Example 7 Important
Example 8
Example 9 Deleted for CBSE Board 2022 Exams
Example 10 Important Deleted for CBSE Board 2022 Exams
Example 11 Important Deleted for CBSE Board 2022 Exams
Example 12
Example 13 Important
Example 14 Important
Example 15 Important
Chapter 8 Class 10 Introduction to Trignometry (Term 1)
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.