Product Identities (Product to Sum Identities)

Product to sum identities are

  2 cos⁡x  cos⁡y = cos⁡ (x + y) + cos⁡(x - y)

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

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

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

  1. Chapter 3 Class 11 Trigonometric Functions
  2. Concept wise
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Product Identities (Product to Sum Identities) Product to sum identities are  2 cos⁡x  cos⁡y = cos⁡ (x + y) + cos⁡(x - y)  -2 sin⁡x  sin⁡y = cos⁡ (x + y) - cos⁡(x - y)  2 sin⁡x  cos⁡y = sin⁡ (x + y) + sin⁡(x - y)  2 cos⁡x  sin⁡y = sin⁡ (x + y) - sin⁡(x - y)

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