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If there are handy of R3 vectors, how to find 3 of them which barely enveloping a specified vector?

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If there are handy of R3 vectors: r1, r2, r3, r4, r5, r6

Which 3 of them barely envelop a specified vector: a?

One can change all:( r1, r2, r3, r4, r5, r6, a) into unit vectors and compare, but it is too clumsy...

 

Edited by Tapeworm

Your terminology is confusing.

 

"handy (?) of R3 vectors"

"envelop (?) a specific vector" ?

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