What is the size of the angle between the vectors a = (2,5, -1) and b...

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What is the size of the angle between the vectors a = (2,5, -1) and b = (-3, 2,6)? 093 87 35 O 177

If k is any positive number, what is the size of the angle between the vectors a = (k, k) and b=(-3, 4)? 81.9 O It cannot be

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Answer 1

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(هر2ر =ط (ا - رد (2) a= Son a.b Loso= اطا اد( DIST (5ر2ر3-. - رد رد) - 2 (یا ( عال سازی (+(2) - 6 ||0-6 coso وہ کر * 30 2. - a=(kk); 3=(-3, 6) a.b coso lal lb) (K, K). (-3, 4) V x²+k? V(3) ² (6) 2 11 -3k+uk Vak? √25 K Kuz X5 coso 52 siz cos (str) =

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