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Ex 8.4, 5 - Chapter 8 Class 10 Introduction to Trignometry - Part 14

Ex 8.4, 5 - Chapter 8 Class 10 Introduction to Trignometry - Part 15

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Ex 8.4, 5 Prove the following identities, where the angles involved are acute angles for which the expressions are defined. (vii) (sin 2 sin3 )/(2 cos3 cos )=tan Taking L.H.S (sin 2 sin3 )/(2 cos3 cos ) = (sin (1 2 sin2 ))/(cos (2cos2 1)) = sin /(cos ) ( (1 2sin2 ))/((2cos2 1)) = tan ( (1 2sin2 ))/((2cos2 1)) = tan ((1 2sin2 ))/((2(1 sin2 ) 1) ) = tan ((1 2sin2 ))/((2 2sin2 1)) = tan ((1 2sin2 ))/((1 2sin2 ) ) = tan 1 = tan = R.H.S Hence proved

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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.