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1) Find the angle θ between the vectors a=9i−j−4k and b=2i+j−4k. 2)  Find two vectors v1 and...

1) Find the angle θ between the vectors a=9i−j−4k and b=2i+j−4k.

2)  Find two vectors v1 and v2 whose sum is <-5, 2> where v1 is parallel to <-3 ,0> while v2 is perpendicular to < -3,0>

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