Solve the question in the image and also upload the solution

A light rod of length l has two mass M and 2M attached to its two end.

C)ML²/6 As for two mass system MOI: (M1M2/M1+M2)Leff² 2M/3 (Lsin30)² ML²/6 How lsin30 Can u solve my other question also pls As i have taken component Lsin30 which in required component for inertia Provide me link I will be happy to solve them :-)