the angle between 2i+j+2k and B=i-j
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cos theta = A.B/|A||B|
use this formula and find the answer...
nrana:
if u will not get answer..then plzz tell me..
i will help u..
i know that but my answer is coming 1/√10
is it wrong??..
whaf is the exect answer..??
1/2
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