I was watching video about 3D rotation and Cross product (link at below of the post), at this moment of the video, he claimed the projected vector by v’ onto v and v’ onto n^×v are cos(θ)v and sin(θ)(n^×v) respectively (Timestamp: 7:44)
- What is the proof of that?
- Why is v’ equal to the sum of the vertically projected vector and horizontally projected vector? Proof? (Timestamp: 7:11)
Please explain like I’m five :) Thank you!
This is link to video: https://youtu.be/UaK2q22mMEg?t=548