Sum to product identities are

Sum Identities (Sum to Product Identities).jpg

  1. Chapter 3 Class 11 Trigonometric Functions (Term 2)
  2. Concept wise


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

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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.