Powers of i and the Mod-4 Cycle
Why do all powers of i collapse to just four values, and how does a single division-with-remainder by 4 give you the answer in seconds?
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Feynman technique
Learn with the Feynman Technique
Explain each idea in your own words in handwriting, then upload a photo for AI critique. Two attempts per question — there's no "right" answer, only depth of understanding.