If The Vectors  make An Obtuse Angle For Any x Ïµ (0, ∞), Then c belongs To 

If  are any three non-coplanar vectors, then  is equal to

If  are only three non-coplanar vectors, then 

Let  be three vectors having magnitudes 1, 1 and 2 respectively such that  then the acute angle between 

If 

The length of the longer diagonal of the parallelogram constructed on  if it is given that  and 

 represent respectively  where ABC is a triangle. Then, 

The vector  is rotated through an angle θ and doubled in magnitude, then it becomes  The value of x are

If  are unit vectors such that the vector  is perpendicular to  is perpendicular to  then the angle between  is

If G is the centroid of âˆ†ABC such that  are inclined at on obtuse angle, then 

A vector of magnitude 4 which is equally inclined to the vectors  is