Question

what is integration formula​

Answer 1

The notation, which we're stuck with for historical reasons, is as peculiar as the notation for derivatives: the integral of a function f(x)f(x) with respect to xx is written as

∫f(x)dx∫f(x)dx

The remark that integration is (almost) an inverse to the operation of differentiation means that if

ddxf(x)=g(x)ddxf(x)=g(x)

then

∫g(x)dx=f(x)+C