Short Answer TypeFind the angle between two vectors 
having the same length (magnitude) 
and their scalar products is -1.
having the same magnitude and such that the angle between them is 30° and their scalar product is 3.
having the same magnitude and such that the angle between then is 60° and their scalar product is 1/2.
are two vectors such that 
find the angle between 
be the angle between 
.
Switch
such that 
and 
.
and 
if 
show that 
prove that either 
or 
or 
is perpendicular to 
.
