April 2021 0 13 Report
1.Упростите выражение: tg40'+tg20' / 1-tg40' * tg20' 2.Решите уравнение: sin x * cos3x + sin3x * cosx = 1 3. Вычислите cos(альфа+бетта), если cosальфа = -3/5 и ПИ<альфа<3ПИ/2 , sinбетта= 8/17 и ПИ <бетта<Пи
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