Prove Cosine Law With Dot Product of Vectors - EDEXCEL - GCSE

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  1. Anil Kumar
  2. MCV4U
  3. Calculus
  4. vectors
  5. calculus and vectors
  6. grade 12
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Комментарии
Автор

For addition of a and b vectors must be kept cyclically. Tail of vector a must be on terminal of vector b.

lovephysics
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Or angle must be taken between a and c these are I'm cyclical order

lovephysics
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something i've been very struggling. You can write that vector b = a + c. Then after multiblication you will get b^2=a^2 + c^2 + 2ca cos. The plus sign is off. My text book says that now you should use external angle for those two vectors, which will make the equation correct, but i don't really know why and when i should use external vectors. Can you explain why?

janjanowski
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Sir where can I get these questions. Answer please

ufoissg
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Law of addition of vectors when angle between them is theta

lovephysics
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magnitude of vector c^2=(magnitude of vector b -magnitude of vectora)^2

explain plzz sirr

indianwarrior
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How to understand vector C is vector b-a????
PlZ do reply

ipsitamazumder
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how come you can just insert the 'cosθ' at the end? There was no reason given for the action, completely arbitrary.

tar
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I will remove my downvote when you answer the following question - how can we just arbitrarily ad the cosø - can you please give a better answer than 'this is the geometric interpretation' because from what I understand, cosø has some sort of value that when multiplied with the things its next to changes it. What am I missing?

davidcooper