Integral 1) While changing x from a to b 2) Multipliy f(x) by dx 3) Sum all of 2) Definite Integral A NUMBER and represents the area under the curve f(x) from x=a to x=b. For example, Q. There is a function(Definite Integral) log x, how can get the all the area of log x(from 0 to x)? log x : A function that has been set to make this area x. The graph : If you integrate the area of x, is equal to..