Posted by Ariza on Sunday, May 23, 2010 at 5:41pm.
do cross product (perpendicular to both)
i j k
3 -4 1
2 3 -4
(16-3)i + (2+12)j + (9+8)k
13 i + 14 j + 17 k
divide every coefficient by
sqrt (169 + 196 + 289)
to make it a unit vector
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