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**1. Homework Statement**

The question is uploaded.

**3. The Attempt at a Solution**

I have completed the whole question, however, stuck on the last part.

How to find the value about which ## \rm \small \theta## now oscillates?

A source stated that ## \rm \small \alpha## is the value about which ## \rm \small \theta## is oscillating. Can anybody tell me if that is correct? If yes, then why?