If vectors a and B are two non-zero vectors, then the range of the angle between vectors a and B is A,(0,π) B,【0,π) C,(0,π】 D,
If two nonzero vectors have the same direction, the included angle is 0
If two nonzero vectors are in opposite directions, the angle is π
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- 7. If a and B satisfy (3 radical a) + (5|b |) = 7, find the value range of S = (2 radical a) - (3|b |) There should be a reason
- 8. Sn = 1 + 1 / 2 + 1 / 3 +. + 1 / N, f (n) = s2n + 1-sn + 1, f (n) > m is constant, the value range of M is constant
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- 14. It is known that the included angle of non-zero vectors a and B is 60 ° and | a | = | B | = 2. If vector C satisfies (A-C); (B-C) = 0, then | C | = 2? Is to find the value range
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- 20. It is proved that if an > 0 and lim (n →∞) a (n) / a (n + 1) = l > 1, then LIM (n →∞) a (n) / a (n + 1) = l > 1 It is proved that if an > 0 and lim (n →∞) a (n) / a (n + 1) = l > 1, then LIM (n →∞) = 0