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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Sep 2007 10:06:27 IST
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1. Obtain the angle between A+B and A-B if A= 2i^+ 3j^ and B= i^ - 2j^.
2. find the cosin of the between the vectors A= 3i^+j^+2k^ and B= 2i^ - 2j^+4k^.
for that second .................... should we use cos =A*B/modulus of A*B
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5 Sep 2007 12:46:21 IST
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cos  =A.B/ |A||B| A.B=2-6 =-4 modulus A =  13 modulus B = 5 hence cos = -4/ 65 cos = 120 (approx) follow the same procedure in (ii) part
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I WAS BORN INTELLIGENT!!!!!!!
EDUCATION RUINED ME
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