A fundamental problem with mathematics is that it hides beautiful poetry behind an ugly wall of pretentious language and cryptic shorthand, and guards its gates with its most desiccated corpses dressed as teachers.
I hated maths because of the ugly encounters I was forced to endure through my formative years. Abusing, arrogant teachers, walls of arcane symbols and nobody to explain them, the problems impractical, more a punishment than a power.
#Gamedevtip you can turn 3D into 2D pixel art in real time by using a second camera that draws the object to an unfiltered texture.
That texture can then be used as a sprite.
This allows you to do complex deformations and rotations on your 3d objects, but still get that crunchy, aliased, limited palette look.
Put your objects on a separate layer and set the camera culling to only that layer.
This translation from 3d to 2d is also handy because you can use the hierarchy of the 3d skeleton for collision, rag dolls, particle emitter placement.