Please explain it in Matlab code. Thank you.

6. (20 points) Write a Matlab code that uses the forward, backward and centered difference approximation to es- timate the first derivative of the function: f(t) = 25 t cos(t), evaluates the derivative at t = 2 and compare the re- sults with exact value of the derivative. Plot the ab- solute errors vs the step size, h. What is the optimal step size for each case