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Mathematics 23 Online
OpenStudy (anonymous):

let w = <-1,6,-5>, find a unit vector, u, that has a direction opposite that of w.

OpenStudy (amistre64):

so opposite is just -w = <1,-6,5> then scale it back by dividing off its magnitude

OpenStudy (amistre64):

|-w| = sqrt(1+36+25)

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