Topic: How to calculate SHARED AREA UNDER A CURVE

I want to know how I can calculate shared area under a curve. I plan to plot two curves (with polynomial trend lines) and I want to quantify about much they overlap.

Is the program able to calculate shared area under the curve, and if so, how do I go about doing that after I input the data and assigned polynomial trend lines?

Thank you for your help!

Re: How to calculate SHARED AREA UNDER A CURVE

From the FAQ:
Q: How do I calculate the area between the graphs of two functions?
A: If you want to find the area between two functions f1(x)=3x and f2(x)=x^2,
the easiest way is to create a new function that equals the difference between the two functions: f(x)=f1(x)-f2(x)=3x-x^2.
You can then use Calc → Area to calculate the area for a given interval.