The entire area under the curve. But what we could do is introduce a constant that's someplace in between x and x squared. Let's say that constant is c. And break this area into two different areas with c as the divider. So that same exact whole area, we can now write it as two separate integrals. So one integral that represents this area right over here. And then another integral that represents this area right over there. And we just say c is some constant between x and x squared.