PrimaryOne's answer to matt lucas's Junior College 1 H2 Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
PrimaryOne
Primaryone's answer
180 answers (A Helpful Person)
https://proofwiki.org/wiki/Angle_Bisector_Vector#:~:text=4%20Algebraic%20Proof-,Theorem,bisector%20of%20u%20and%20v.