- #1
ricky_fusion
- 27
- 0
Hi,
I have a question about dot product for vector.
For detail : https://ecourses.ou.edu/cgi-bin/ebook.cgi?doc=&topic=st&chap_sec=02.4&page=theory
Is there anyone understand about it and explain to me the basic concept, why :
1. A • B = |A| |B| cosθ, not A • B =A^2 • B^2 - 2AB cosθ (Cosinus equation)
2. A|| = A cosθ u = (A • u) u (for vector component)
A|| = A • u (for direction component)
Thanks,
Ricky
I have a question about dot product for vector.
For detail : https://ecourses.ou.edu/cgi-bin/ebook.cgi?doc=&topic=st&chap_sec=02.4&page=theory
Is there anyone understand about it and explain to me the basic concept, why :
1. A • B = |A| |B| cosθ, not A • B =A^2 • B^2 - 2AB cosθ (Cosinus equation)
2. A|| = A cosθ u = (A • u) u (for vector component)
A|| = A • u (for direction component)
Thanks,
Ricky