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Question

In capital delta A B C comma I f a comma b, care in H.P., then Sin invisible function application 2 A over 2 , Sin2 fraction numerator B over denominator 2 end fraction , Sin2 fraction numerator C over denominator 2 end fraction are in

  1. A. P    
  2. G P    
  3. H. P    
  4. A. G. P.    

The correct answer is: H. P


    a comma b comma c are in H. P comma fraction numerator 1 over denominator a end fraction comma fraction numerator 1 over denominator b end fraction comma fraction numerator 1 over denominator c end fraction are in A. P fraction numerator s minus a over denominator a end fraction comma fraction numerator s minus b over denominator b end fraction comma fraction numerator s minus c over denominator c end fraction are in A. P

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