Uploaded February 2024 | Updated September 2026, 1 week ago

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In this video, I derive the rotation matrix for 2D coordinate systems.

Other rotation matrix video: youtu.be/8gScj_h_zhI?si=Xy8Up5PzZo9N1JEY
sin(a-b) proof: youtu.be/40rovvmDUWI?si=K2ag-YiocU-gUGRi
cos(a-b) proof: youtu.be/w6hNam8nrIY?si=Zo3Z0w_w9YeFqae0