Consider the function f(x)=x³-4x²+6. 1. Calculate the value of df/dx at x=2 using backward-, forward-, and central-difference approximations (let Ax=1). 2. Calculate the value of d²f/dx² at x=2 using central-difference approximation (again, let Ax=1). 3. Among the four approximations you calculated in Parts 1 and 2, which contain no error? Why?
