If  are Unit Vectors Such That  and  then 

 are three non-zero vectors which are pair wise non-collinear. If  is collinear with  is collinear with  is:    

 unit vectors such that , then the value of  

If  are unit vectors, then the greatest value of

If the unit vectors  are inclined at an angle 2θ such that  then θ lies in the interval 

Let  be two unit vectors and α be the angle between them, then  is a unit vector, if α =

If  then the angle between  

Let  are two vectors inclined at an angle of 60^o. If  then the angle between   

If  are unit vectors such that  is also a unit vector, then the angle between , is

If  are unit vectors such that 

If  are unit vectors inclined to x-axis at angles 30^o and 120^o, then  equals