What is the significance of studying calculus?

If your thinking is limited to approximate calculations, then your thinking is too superficial.

As you said, with current technology, the calculation of integrals must be as precise as possible. What’s the point of doing research?

In fact, this is not the case.

First of all: Calculus is involved in every field. This is undeniable and its significance is self-evident.

In-depth research is It is very necessary. Don't deny what the masters have studied just because you think you can make a calculator. Their research is "funny". I think it is ridiculous for you to ask this naive question.

If you don't study, Then there is no need for development in this world. Do you think this is necessary?

Student: There is still a long way to go in seeking knowledge, so don’t be arrogant and be humble...