9. The scalar product





By definition of the scalar product, u·v = uv cos , where is the angle between u and v. If = 90° then cos = 0. Given two nonzero vectors u and v
If u = u_{1}i + u_{2}j + u_{3}k and v = v_{1}i + v_{2}j + v_{3}k are given in Cartesian form then the above reads
For vectors in the plane drop the third terms.


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