Write the given formulae: Sin C + Sin D = ? SinC - Sin D = ? Cos C + Cos D = ? Cos C - Cos D = ?

  1. sin C + sin D = 2 sin [(C + D) / 2] cos [(C – D) / 2]
  2. sin C – sin D = 2 cos [(C + D) / 2] sin [(C – D) / 2]
  3. cos C + cos D = 2 cos [(C + D) / 2] cos [(C – D) / 2]
  4. cos C – cos D = – 2 sin [(C + D) / 2] sin [(C – D) / 2]

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