Proof Using Euler's Theorem: Rational Implies Recurring

From a channel Lumen includes in full: Dr Barker, a maths lecturer, posts clean, proof-based problem videos in algebra, calculus, trigonometry and number theory, deriving each result carefully.

A 13-minute video from Dr Barker's catalogue; the title names its topic.

Video by Dr Barker, played through YouTube's embedded player.