Ex 7.3, 2 - Integrate sin 3x cos 4x - Class 12 CBSE - Integration using trigo identities - CD and CD inv formulae

Ex 7.3, 2 - Chapter 7 Class 12 Integrals - Part 2

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Transcript

Ex 7.3, 2 sin 3 cos 4 We know that 2 sin A cos B=sin + + sin sin A cos B= 1 2 sin + + sin Replace A by 3 & B by 4 sin 3 cos 4 = 1 2 sin 3 +4 + sin 3 4 sin 3 cos 4 = 1 2 sin 7 + sin sin 3 cos 4 = 1 2 sin 7 sin Now, sin 3 cos 4 = 1 2 sin 7 sin = 1 2 sin 7 sin Now, sin 3 cos 4 = 1 2 sin 7 sin = 1 2 cos 7 7 + cos + = + +

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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.