Answer:
Normalize the vectors (create unit vectors in the same directions).
Normalize the vectors (create unit vectors in the same directions).
The diagram shows each vector after it has been normalized. (Remember, this means creating a unit vector in the same direction as the original vector).
Now which dot product is larger? au · bu , or au · cu ?
Hint: remember that u · v = |u||v| cos θ. But now both vectors have length 1.0.