$(3)$ Consider a loaded statically determinate beam, as shown in Figure $3.$ Determine the relative rotation between the right and left edges of point $E({}_{E^{-}-E^{+}})$using $($a$)$ the unit load method, and $($b$)$ the conjugate beam method.

$K_{\frac{L}{2}}^{\frac{L}{2}}**\frac{L}{2}**\frac{L}{2}$

Figure $3$