Write a third-order function. Using this function, calculate the value of the function for x=2 using the Newtonian finite difference method, using the values x=1, x=4, x=5 and x=6. Take the real value as the value you found from the calculator. Specify the error value as relative error and absolute error. a) Solve the derivative of the function in Question 2 at x=0.6, taking the step size h=0.3, using highly accurate differential formulas. b) Calculate the value of the integral