I wonder what I was dreaming to prompt that. I hope it wasn't the Richard Stallman Cirque de Soleil thing again.
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веб-комиксы с юмором и их переводы Подписчиков: 5714 Сообщений: 177241 Рейтинг постов: 3,427,135.3Комиксы Комиксы xkcd
Someone should really bring them a ladder and remind them to build the Endless Stair *first* next time.
Комиксы Комиксы xkcd
Handy exam trick: when you know the answer but not the correct derivation, derive blindly forward from the givens and backward from the answer, and join the chains once the equations start looking similar. Sometimes the graders don't notice the seam.