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Angular distance

ĄDA(x, y) = angle (x, y)

Ą0 Ł DA(x, y) Ł p

Ąif 0 then x & y colinear Ń same idea

Ąif p/2 then nothing in common

Ąif p then DA(x, -x) with -x Ń anti-idea of x

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xŐ

y

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