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Question

s i n space A plus s i n space 3 A plus s i n space 5 A plus s i n space 7 A equals

  1. 4 s i n space A c o s space 2 A c o s space 4 A    
  2. 4 s i n space A c o s space 2 A c o s space 3 A    
  3. 4 c o s space A s i n space 2 A s i n space 4 A    
  4. 4 c o s space A c o s space 2 A s i n space 4 A    

The correct answer is: 4 c o s space A c o s space 2 A s i n space 4 A


    Apply SinC+SinD formula

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