The angle between two vectors a and b is ∅, where ∅≠90°. Under what conditions will |Proj_{ab}|^{2} + |Proj_{ba}|^{2} = 1?
Don't really know where to start on this one.
Hi anonymoususer20!
I'm not entirely sure what you mean with Proj_{ab}.
Presumably it is:
where is the unit vector in the direction of .
If that is the case you can substitute .
And you can substitute something similar for the other projection.
Have you tried that?
If so, what did you get?