прим.a - альфа
tg a + tg2a /1-tga tg2a = 1
tg(а+2а)= tg3а=1
3a=п/4+пk
a=п/12+пk/3, k - целые числа
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tg a + tg2a /1-tga tg2a = 1
tg(а+2а)= tg3а=1
3a=п/4+пk
a=п/12+пk/3, k - целые числа