Maths-
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Question

In any straight triangle A B C fraction numerator left parenthesis a plus b plus c right parenthesis left parenthesis b plus c minus a right parenthesis left parenthesis c plus a minus b right parenthesis left parenthesis a plus b minus c right parenthesis over denominator 4 b squared c squared end fraction =

  1. cos squared space A
  2. cos squared space B
  3. sin squared space A
  4. sin squared space B

The correct answer is: sin squared space A

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