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WaginaFox
@WaginaFox
July 2022
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belozerova1955
Числитель: 1-2cos²α=(sin²α+cos²α)-2cos²α=sin²α-cos²α=
= (sinα-cosα)·(sinα+cosα)
Знаменатель: (sinα+cosα)
Сократим дробь на (sinα+cosα)
Ответ: (sinα-cosα)
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Answers & Comments
= (sinα-cosα)·(sinα+cosα)
Знаменатель: (sinα+cosα)
Сократим дробь на (sinα+cosα)
Ответ: (sinα-cosα)