Which of the following is true?

  • A
    $a\cos A + b\cos B + c\cos C = R\sin A\sin B\sin C$
  • B
    $a\cos A + b\cos B + c\cos C = 2R\sin A\sin B\sin C$
  • C
    $a\cos A + b\cos B + c\cos C = 4R\sin A\sin B\sin C$
  • D
    $a\cos A + b\cos B + c\cos C = 8R\sin A\sin B\sin C$

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