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Исследование функций ...Производная и первообразная. Задача 12, 2016
https://drive.google.com/file/d/0B2RDrG0rMlaEVi1HNmpiVVplMlU/view?resourcekey=0-8iN2YSJtpTc8XMdo0m49iw
https://drive.google.com/file/d/0B2RDrG0rMlaEVi1HNmpiVVplMlU/view?resourcekey=0-8iN2YSJtpTc8XMdo0m49iw