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Spaced repetition: each card comes back after a longer gap every time you remember it, and sooner when you forget. Ten minutes a day is enough. Your deck is stored only in this browser.
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The Anki file has the TeX source of the math, written as \( … \) and \[ … \], which Anki shows with its built-in MathJax. In Anki choose File → Import; the separator (semicolon) and “Allow HTML” are set by the file.