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Grade: 12th pass 

                        
If a,b,c are three unit vectors such that a×(b×c)=(1/2)×b then b is not parallel to c , find angle between a and b
2 years ago

Answers : (1)

Arun
24738 Points 
							
Dear Ajay
 
a X (b X c) = (a.c) b – (a.b)c
 
but a.b = 0
 
hence
 
angle between a and b is 90 degree
 
Regards
Arun
2 years ago
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