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## Homework Statement

I'm currently studying for an exam, but I don't know exactly what could be on it - the specification is very vague. I was just wondering if there were some useful proofs I should know? I've covered things like proving the diffraction grating experiment, centripetal acceleration or snells law and deriving capacitance equations for time constant by integration, so nothing too mathematically complicated. I was wondering if there was anything more you could think of that are nice proofs I should learn for my level (18 year old/a level)? Thank you :)