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= A - B
= (3,2) - (4,6)
= (-1, -4)
v = CA
= A - C
= (3,2) - (6,0)
= (-3, 2)
u - 2v = (-1, -4) - 2 (-3, 2)
= (-1, -4) - (-6, 4)
= (5, -8)