\(OAB\)is a triangle.\(\overset{\rightarrow}{OA}=a\;\overset{\rightarrow}{OB}=b\;\) Find \(\overset

\(OAB\)is a triangle.\(\overset{\rightarrow}{OA}=a\;\overset{\rightarrow}{OB}=b\;\) Find \(\overset - চর্চা