How did he get the second equation (i.e what is the integration method for function f(x,y,y')). please help me with the solution step by step. y(x) dxdx = * (x,y,y) dxdx y(x)-y(x)-hy'(x) = f(x - x)f(x, y, y') dx. x S = X-Xitl h Jy'(x) dxdx = f(x,y,y) dxdx 44 y(x)- y(x)-hy' (x) = (x-x)f(x, y,y) dx. (9) We substitute the f (x.yy') in (9) with the same interpolation polynomial. Taking x - x = -s h and replacing dx = h ds in equation (9) yields n+1