Question
Fri February 20, 2009 By:

to prove

Expert Reply
Fri February 20, 2009

a (a.b) - b( a.a ) = b (a.a) - a(a.b)

2a (a.b) = 2 |a|2 b

a =  ( |a|2/ (a.b) ) b   ==> a = λ b

means a and b are parallel to each other ==> a x b =0

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