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Resultant of two vector = (P^2 + Q^2 + 2PQCosФ)^1/2
direction tanα = QSinФ / (P + QCosФ)                   (α angle with vector P)
given P = A ,Q = A  
putting on above equation 
resultant R = 2ACos(Ф/2)
direction α = Ф/2
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