УМФ, , вывод уравнения колебаний струны
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![Марія Чайковська - Целуй меня [2015 Full Album]](https://sun9-67.userapi.com/NhoMB9Hr2XluNLXADVgKNB47sQOyBz3zPhB-9g/mfCkE7Wy58s.jpg)
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