1. Chapter 3 Class 11 Trigonometric Functions
  2. Concept wise
  3. Cos x + cos y formula

Sum Identities (Sum to Product Identities)

Last updated at May 30, 2018 by

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Sum to product identities are

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  1. Chapter 3 Class 11 Trigonometric Functions
  2. Concept wise

    3. Cos x + cos y formula

    2 sin x sin y formula →

Transcript

cos x + cos y = 2 cos (x+y)/2 cos (x -y)/2 cos x - cos y = - 2 sin (x+y)/2 sin (x -y)/2 sin x + sin y = 2 sin (x+y)/2 cos (x -y)/2 sin x - sin y = 2 cos (x+y)/2 sin (x -y)/2

Chapter 3 Class 11 Trigonometric Functions
Concept wise

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.