ta có $sin2A+sin2B+sin2C$

      $=$$2sin(A+B)cos(A-B) + 2 sinCcosC$

      $=2sinCcos(A-B)+2sinCcosC$

      $=2sinC ( cos(A-B) + cosC)$

      $=2sinC ( cos(A-B) - cos(A+B))$

      $=2sinC.2sinAsinB$

      $=4sinAsinBsinC$
bạn click V đc ko??? –  @_@ *Mèo9119* @_@ 04-03-16 09:14 PM
Cảm ơn bạn nhiều lắm ^^ –  thunga2271 04-03-16 09:14 PM

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