СРОЧНО, ДАЮ 100 БАЛЛОВ
Якщо tg a = – 1, то ctg a =
Якщо ctg a = 0, то tg a =
Дано: х = 2tg a, у = ctg a.
Тоді ху =
Дано: tg a + сtg a = 2.
Тоді tg2 a + сtg2 a =
Вираз tg a · сtg a – 1 =
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