Формулы двойного и половинного угла|Практика|Часть 2.5
Практика. Средний уровень. Упрощение выражений.
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![БУХГАЛТЕРСКИЕ ПРОВОДКИ с нуля: ПОЛНЫЙ КУРС за 5 часов [ТЕОРИЯ 📚 + ПРАКТИКА 💻]](https://sun9-25.userapi.com/gSSLCLoeYrl-g9aTvhO1_rp0rWF1fRhcBZExmw/mDpnqev9H0A.jpg)
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