Mark the correct alternative in each of the following:

If and , then is

Mark the correct alternative in each of the following:

If and , then a unit vector normal to the vectors and is

Mark the correct alternative in each of the following:

A unit vector perpendicular to both and is

Mark the correct alternative in each of the following:

If are unit vectors, then

Mark the correct alternative in each of the following:

If θ is the angle between the vectors and , then sin θ =