Cross Product Linearity
Goal
Recall
- componentwise addition: , and
- linearity of dot products: + +
- dot product and parallel component:
- cross product and perpendicular component:
Link
Key: take away the parallel components and parallel to , since they don't "rotate ".
- LHS:
- RHS:
Observation
With the vector pointing upwards, the vector is
- rotated 90° anticlockwise, then
- scaled by a factor of