o=vector([0,0]) #creates a vector, x= vector([component x1, component x2])
p1=vector([1,-4])
p2=vector([3,1])
q=vector([3,2])
q1=vector([1,-2])
q2=vector([-1,-4])
print "vector OQ=", q-o
print "vector P1Q1=", q1-p1
print "vector P2Q2=", q2-p2
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vector OQ= (3, 2)
vector P1Q1= (0, 2)
vector P2Q2= (-4, -5)
vector OQ= (3, 2)
vector P1Q1= (0, 2)
vector P2Q2= (-4, -5)
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