Question

E angle between vector a and the resultant of a+b and a-b where b is the other vector..

Answer 1

I’m assuming you’re looking for a formula to calculate the angle between (A+B) and (A-B). The angle between these two vectors will depend on the magnitudes of A and B, and also the angle between A and B, which we will call  Now let  be the angle between (A+B) and (A-B). Using the concept of dot product, we get: