કોઈપણ ત્રિકોણ $ABC$ માં,$(b+c) \cos A + (c+a) \cos B + (a+b) \cos C$ ની કિંમત શું થાય?

  • A
    $0$
  • B
    $a+b+c$
  • C
    $a+b-c$
  • D
    $a-b-c$

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