Learning immediately: https://edu.csdn.net/course/play/26262/326626?utm_source=blogtoedu
# Practical derivation method
Adding the derivative function ##
(U + v) '= u' + v 'proving, u + v do a whole look
Multiplying the derivative function ##
(uv)' = u'v+uv'
P: The results again -x + x polynomial Minato
## chain rule
