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OpenStudy (anonymous):
find the angle between 3u-v and u+v. u=-i+2j-2k, v=3i+4j-12k
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OpenStudy (anonymous):
use scalar multiplication of vectors
OpenStudy (anonymous):
yh i have done that, how do i find the angle
OpenStudy (anonymous):
a.b =|a|*|b|*cos(theta)
OpenStudy (ajprincess):
(3u-v ).(u+v)=l3u-vllu+vlcosx cosx=(3u-v ).(u+v)/l3u-vllu+vl
OpenStudy (anonymous):
will it be (-6i+2j-6k)(2i+6j-14k)
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