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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