Find the cosine of the angle between a and b and make a sketch. a. a =
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a. a = (1, -3), b = (-1, 2)
b. a = (-1, -2), b = (6, 0)
c. a = (2, -1), b = (-2, -4)
d. a = (4, -7), b = (-8, 10)
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