In the differential calculus,
we are given a function and we have to find the derivative or differential of
this function, but in the integral calculus, we are to find a function whose
differential is given Thus, integration is a process which is the inverse of
differentiation Let 
F( )
( )
d
x
f x
dx
= Then we write 
( )
F ( )
C
f x dx
x
=
+
∫