Всё решаем по формулам.
tgα×ctgα=1 , tgα=ctg(90°-α), ctgα=tg(90°-α)
tg 20°=b
ctg70°=tg20°=b
ctg20°=1/tg20°=1/b
tg70°=ctg20°=1/b
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Всё решаем по формулам.
tgα×ctgα=1 , tgα=ctg(90°-α), ctgα=tg(90°-α)
tg 20°=b
ctg70°=tg20°=b
ctg20°=1/tg20°=1/b
tg70°=ctg20°=1/b