Since the indefinite integral is to find the original function, it is the inverse operation of the derivative function, so let's put it here simply-the topic is the "operation" of the function
Derivative function is a kind of calculation method that can be nested to solve. The difference from the original function is that you don't need to make up a specific form. As long as you remember the basic formula, you can usually solve it. Unlike finding the derivative of a certain point, there is no step to substitute a certain point.
Finding indefinite integral requires us to make up a specific form to get rid of the integral number, that is, to complete the calculation of the integral part. Unlike definite integral, there is no substitution step of upper and lower limits.
Here, I want to say that the derivative of a certain point can be obtained by defining the limit, or the derivative function can be obtained and then substituted into a certain point.