 \vec{ AB }= \vec{ OB }- \vec{ OA }   

A = (5.039669421487604, 3.4604958677685946)
B = (7.6512396694214875, -0.40727272727272695)
O = (0.8743801652892575, -0.3576859504132229)
u = Vector(O, A)
v = Vector(A, B)
w = Vector(O, B)