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I'm not sure how to work this out - I have the answer but don't know how to get it 10 If a and b

I'm not sure how to work this out - I have the answer but don't know how to get it

10 If a and b are vectors such that Ja| = 2, |b| = 4 and the angle between a and b It, find the angle between a a and a - b b b and a + b c 3a - b and b

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