| Author |
Message |
![[Post New]](/templates/default/images/icon_minipost_new.gif) 20 Dec 2007 20:05:45 IST
|
|
|
If a,b and c are unit vectors ,then Ia-bI^2 + Ib-cI^2 + Ic-aI^2 does not exceed
4
9
8
6
5 salutes to one who ans and explain his ans correctly.....
|
|
|
|
20 Dec 2007 20:07:40 IST
|
|
|
bhai plz make the questiona bit more clear plz??
|
this reply: 0 points
(with 0 
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
20 Dec 2007 20:13:01 IST
|
|
|
wat is l yaar????
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
20 Dec 2007 20:20:10 IST
|
|
|
ans. max. value is 9 !
|
this reply: 5 points
(with 1
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
20 Dec 2007 20:23:23 IST
|
|
|
without havin ne info abt l how can u solve neways the logic behind this prob is
assume v= ai+bj+ck w= li+lj+lk
we no that a.b<= mod a mod b
similarly sme x= l^2i +l^2j+l^2k
again a.b<= mod a mod b
then add them to get the req sol
HOPEFULLY IT HELPS
ne doubts nudge me
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
20 Dec 2007 20:23:31 IST
|
|
|
2(a^2+b^2+c^2)-2(a.b+b.c+c.a)
now , let a,b,c be such that they have 120 degree angle b/w eachother.
hence,
2(1+1+1)-2(-1/2-1/2-1/2)
=6+3
=9!
|
this reply: 5 points
(with 1
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
20 Dec 2007 20:35:31 IST
|
|
|
hopefully i could make it clear
|
this reply: 5 points
(with 1
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
20 Dec 2007 20:41:03 IST
|
|
|
Re:5 salutes assured...gud one
|
this reply: 5 points
(with 1
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
Moderation Team
![[Up]](/templates/default/images/icon_up.gif "[Up]"){kind=icon}
![[Thumb - untitled.jpg]](/upload/2007/12/20/6127de739ab0ca3b4643bd580bed608e_34186.jpg_thumb)
