Chapter 2.4, Problem 2SA

Plot the solution from Step 1 against the correct solution $y\left(x\right)=\left(f/24EI\right)x^2\left(x^2-4Lx+6L^2\right)$, where $f=f(x)$ is the constant defined above. Check the error at the end of the beam, $x=L$

meters. In this simple case the derivative approximations are exact, so your error should be near machine roundoff.