Definite integrals
In this file, there is way to find the definite integral of a function as well as there is most important and basic theorem of calculus i.e fundamental theorem of calculus
Integral
This article is about Integrals which includes Basic Concepts of integrals and its types,Fourier series ,also complex problems with Answers
Change of variable in triple integral
This is mainly based or focused on a topic change of variable in triple integrals.It contains how to calculate area of parametric surface.