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Problem 4.10j : Proof on dot-product

The dot-product of two vectors, let's say and is defined either as :

or as :

Proof that both equations give the same answer. To make things a little easier assume that both and have zero z-components. A sketch might be useful.

My solution


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Zig Herzog, hgn@psu.edu

Last modified : Thu Jun 19, 1997