two vectors u = [5,4, -3], v = [1, -2, -1] form an angle θ that can be less than 90 ° (acute), greater than 90 ° (obtuse) or equal to 90 ° (straight), flat (of 180 °). determine what kind of angle is formed:? A) straight, because u * v = 0 B) obtuse, because cos θ = - 0.57327643 C) flat, because cos θ = - 1 D) Acute = cos θ = 0.866025403    what is the correct?

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