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Question

If A =sin invisible function application fraction numerator 2 pi over denominator 7 end fraction plus sin invisible function application fraction numerator 4 pi over denominator 7 end fraction plus sin invisible function application fraction numerator 8 pi over denominator 7 end fractionand B =cos invisible function application fraction numerator 2 pi over denominator 7 end fraction plus cos invisible function application fraction numerator 4 pi over denominator 7 end fraction plus cos invisible function application fraction numerator 8 pi over denominator 7 end fractionthen square root of A squared plus B squared end root is equal to

  1. 1    
  2. square root of 2    
  3. 2    
  4. square root of 3    

The correct answer is: square root of 2


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