Question

which are important in integral calculus and what r should study in that lesson

Answer 1

First you should Differential Calculus..
cause Integral calculus is just the opposite process of Differential Calculus..
The process of finding the derivative of any function is termed as differentiaton..
and the recovering of the original function..
from there derivative is termed as Integration..
It's a very interesting topic.. If you study with concentration..
Hope it Helps..