Please code IN MATLAB for Forward approximations of the first derivative O(h)

And test the script with the function

- Frmula progresiva: se calcula el polinomio que interpola (a,f(a)),(a+h,f(a+h)). A partir de dicho polinomio, se tiene la aproximacin f(a)hf(a+h)f(a). f1=0.1x40.15x30.5x20.25x+1.2 y f2(x)=x61, en x=0.5