Math, Mathematics, Science, Numerical Analysis, Integration.
dotted lines. Hence each purple dot on the red graph represent (x_r,f(x_r)) and here x_0 = a is used. Fig-4: Here h = 2 unit. As you can see when we move along the arrows from 1st x to 2nd x, we add a h. You may ask why x_r has such a value ? You can see in the figure-4, As we move from x_0=a to