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Докажите справедливость равенства
CosП/9cos2П/9cos4П/9=1/8
Ответы 1
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основная идея: разделил числитель и знаменатель дроби на 2sin20°, работал с формулой sin(2a)=2sinacosa, и дальше так делил на 2 чтобы использовать эту формулу
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Автор:
bridgetteiiby - 5 лет назад
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