1.

Let origin O be the orthocentre of an equilateral triangle ABC. If −−→OA=→a,−−→OB=→b,−−→OC=→c, then −−→AB+2−−→BC+3−−→CA=

Answer»

Let origin O be the orthocentre of an equilateral triangle ABC. If OA=a,OB=b,OC=c, then AB+2BC+3CA=



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