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Question

Let P open parentheses ct subscript 1 comma straight c over straight t subscript 1 close parentheses and Q open parentheses ct subscript 2 comma straight c over straight t subscript 2 close parentheses be the points of a rectangular hyperbola x y equals c squared which subtends  at another point R ' of the given hyperbola, if ' s ' be the mid polint of PQ and ' straight O to the power of straight prime centre of the hyperbola then area of the straight triangle ROS is equal to

  1. fraction numerator straight c squared open parentheses 1 plus open parentheses straight t subscript 1 straight t subscript 2 close parentheses squared close parentheses open vertical bar straight t subscript 1 plus straight t subscript 2 close vertical bar over denominator 4 open vertical bar straight t subscript 1 straight t subscript 2 close vertical bar square root of open vertical bar straight t subscript 1 straight t subscript 2 close vertical bar end root end fraction
  2. fraction numerator straight c squared open vertical bar t subscript 1 plus t subscript 2 close vertical bar over denominator 4 open vertical bar t subscript 1 t subscript 2 close vertical bar square root of open vertical bar t subscript 1 t subscript 2 close vertical bar end root end fraction
  3. fraction numerator straight c squared open vertical bar 1 plus straight t subscript 1 straight t subscript 2 close vertical bar open vertical bar straight t subscript 1 plus straight t subscript 2 close vertical bar over denominator 2 open vertical bar straight t subscript 1 straight t subscript 2 close vertical bar square root of open vertical bar straight t subscript 1 straight t subscript 2 close vertical bar end root end fraction
  4. none of these

The correct answer is: fraction numerator straight c squared open parentheses 1 plus open parentheses straight t subscript 1 straight t subscript 2 close parentheses squared close parentheses open vertical bar straight t subscript 1 plus straight t subscript 2 close vertical bar over denominator 4 open vertical bar straight t subscript 1 straight t subscript 2 close vertical bar square root of open vertical bar straight t subscript 1 straight t subscript 2 close vertical bar end root end fraction


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