If  are three vectors such that  show that the three vectors  are orthogonal in pairs and .
                                         Again, Â
                       ...(2)                                          Â
From (1) and (2), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
Short Answer Type
Long Answer Type
 are three vectors such that 
 show that the three vectors 
 are orthogonal in pairs and 
.
              
         ...(2)
 Is the  converse true? 
 show that 
. Interpret the result 
   then prove that  
 where m is a scalar.
 and  
 then 
, where 
 is a scalar.
 and 
 then 
 are mutually perpendicular unit vectors and 
 then 
 is parallel to 
 .
 and give a geometrical interpretation of it.
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