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matrosovakat
@matrosovakat
July 2022
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Докажите что верно равенство (tg x - ctg x) tg2x = -2
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sagalex54
Применим формулу разложения : tg2x=2/(ctgx- tgx);Откуда имеем, ввелся знак минус за скобку -2(tgx-ctgx)/(tgx-ctgx)= -2;-2=-2;Что и требовалось доказать !
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