mck system
https://ctms.engin.umich.edu/CTMS/index.php?example=Introduction§ion=SystemModeling
https://ctms.engin.umich.edu/CTMS/index.php?example=Introduction§ion=SystemModeling
feedback system에서 open loop, closed loop가 헷갈림. 동영상 마지막에 closed loop transfer fucntion은 Routh-Hurwitz Criteria 말고 사용하지 않음.
시험에 낼지 모르겠지만, 정리하는 겸..어렵다. https://en.wikipedia.org/wiki/List_of_trigonometric_identities