Determine the couple moment M that must be applied to member DC for equilibrium of the q...

Determine the couple moment M that must be applied to member DC for equilibrium of the quick-return mechanism. Express the result in terms of the angles 4) and 9, dimension L, and the applied force P, which should be changed in the figure and instead directed horizontally to the right. The block at C is confined to slide within the slot of member AB.