Statics Chapter 7 : Sample problem 2

The mass m is brought to an equilibrium position by the application of the
couple M to the end of one of the two parallel links which are hinged as shown. The links have negligible mass, and all friction is assumed to be absent. Determine the expression for the equilibrium angle theta assumed by the links with the vertical for a given value of M. Consider the alternative of a solution by force and moment equilibrium.