The second mathematics question for the 2021 postgraduate entrance examination is really simple, but my basic skills are not solid, and the problems of speed and accuracy are exposed in the examination room. The first choice is to forget the derivative of the variable limit integral and multiply the derivative of the upper limit. The limit is more than the order. Just wrong, 5 points less...
The differential mean value theorem is related to the derivative of function and function
The integral mean value theorem is related to the derivative of integral and integral
Newton Leibniz's theorem is related to differential and integral