Problem $2.$

The beam structure is supported by fixed supports at $\backslash ($ A $\backslash )$ and $\backslash ($ D $\backslash ),$ and roller supports at $\backslash ($ B $\backslash )$ and $\backslash ($ C $\backslash ),$ subjected to external loads as shown in Figure $2.$ The flexural rigidity $\backslash (($E I$)\backslash )$ is constant.

a$)$ Determine the degree of indeterminacy according to the displacement method.

b$)$ Determine the rotation angles at $\backslash ($ B $\backslash )$ and $\backslash ($ C $\backslash ).$

c$)$ Draw the bending moment diagram.

Please do step$-$by$-$step. Thank you