Univariate function integration 1__ Indefinite integral

  One   The relationship between indefinite integral and derivative

dF(x) Express differential ,  F(x) Refer to f(x) The original function of .

That is to say d Followed by a function , Is equal to the derivative of this function plus dx.

That is to say  

d + Dog =  Derivative of dog + dx,        It must be remembered that ！！

Two . Look at some examples

Because the symbols related to integral cannot be directly input into this paper , I use pictures to show

3、 ... and . The substitution method of indefinite integral

There are two kinds of ：

（ One ） The first kind of substitution method , Also known as the method of differential calculus

（ Two ） The second kind of transformation integral method