It is normal for the landlord to have difficulty in understanding the deduction points in the above handout.

This is a common phenomenon. Our careless teaching method is one of the 10,000 victims in Qian Qian.

Everyone is the victim of style of study and rogue teaching method!

2、

Because there are too many math teachers teaching calculus in our university,

Laziness is innate and acquired. For a hundred years, seeking guidance has always been humble, absent-minded, and big.

Big smile, curly hair, y' for derivative. Although this is what Lagrange used in those days.

Symbols are used in our derivation, especially in series expansion, but

In the usual teaching, the landlord may wish to find more original calculus textbooks from all over the world.

Books, let's see how many countries are as lazy as our teachers and professors. !

3、

Because our university math teacher teaches, no one pays attention to teaching methods, pedagogy,

Educational psychology, our teachers and professors have three major diseases:

First, he was careless, confused, and never dared to face up to reality;

Second, in terms of symbolic representation and basic concepts, it completely ignores international norms;

Third, the concepts of misunderstanding, dismemberment, misinterpretation and misinterpretation abound, which is shocking.

4、

As far as the landlord's problem is concerned, it is because we don't like to use dy/dx in a down-to-earth way.

I don't know what it means to leave it behind. Who is right?

Who takes the derivative? How to transform the derivative relationship? A careless and lazy life

Our teacher and professor have never been sober all their lives.

As a result of the long-term past, most college students have completely lost what they should have.

Instinct, intuition and instinctive understanding. It is embodied in these aspects:

A, higher derivative;

B, the derivative of the composite function;

C, finding partial derivatives and full derivatives of multivariate functions;

D. Ordinary differential equations and partial differential equations.

5、

This problem is not a separate problem of the landlord, but a very common problem, and the landlord should

It is not difficult to muster up confidence to get through this level. Think about it carefully and do the math yourself.

Deduce strictly step by step, ask yourself and answer yourself, and never let go of what you don't understand, and you can do it.

To one phone call and a hundred phone calls.

For the detailed process, please refer to the following pictures. If you have any questions, please ask.

If you have a question, you must answer it, and the answer must be based; When in doubt, it is necessary to explain, and it must be meticulous; Mistakes must be corrected, and corrections must be sincere.

(The picture can be clicked to enlarge)