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Ex 7.3, 7 - Integrate sin 4x sin 8x - Chapter 7 Class 12 - Ex 7.3

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


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Ex 7.3, 7 4 sin 8 sin 4 sin 8 We know that 2 = + + = 1 2 + + Replace A by 4 & B by 8 sin 4 sin 8 = 1 2 cos 4 +8 + cos 4 8 sin 4 sin 8 = 1 2 cos 12 + cos 4 sin 4 sin 8 = 1 2 cos 12 + cos 4 sin 4 sin 8 = 1 2 cos 4 cos 12 Integrating both sides sin 4 sin 8 = 1 2 cos 4 cos 12 = +

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.