Знаки синуса и косинуса
В этом уроке применим определение синуса и косинуса для определения знаков тригонометрической функции.
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![Боль в коленях и тазобедренных суставах - сигнал о серьезных проблемах в организме. [Шишова О.И.]](https://sun9-69.userapi.com/-a1P7uFr7Pgt3noy8TlMig0g2_D4dlzjTkI6cg/TTB7LNH7o0A.jpg)
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