Задача 21. Расположите в порядке возрастания числа:   \({\text{ctg}}\dfrac{{2\pi }}{5};\,\,\,\,{\text{ctg}}\dfrac{{3\pi }}{5};\,\,\,{\text{ctg}}\dfrac{{6\pi }}{5}\)

1) \({\text{ctg}}\dfrac{{2\pi }}{5};\,\,\,\,{\text{ctg}}\dfrac{{3\pi }}{5};\,\,\,{\text{ctg}}\dfrac{{6\pi }}{5}\) 2) \({\text{ctg}}\dfrac{{2\pi }}{5};\,\,\,\,{\text{ctg}}\dfrac{{6\pi }}{5};\,\,\,{\text{ctg}}\dfrac{{3\pi }}{5}\)
3) \({\text{ctg}}\dfrac{{3\pi }}{5};\,\,\,\,{\text{ctg}}\dfrac{{2\pi }}{5};\,\,\,{\text{ctg}}\dfrac{{6\pi }}{5}\) 4) \({\text{ctg}}\dfrac{{3\pi }}{5};\,\,\,\,{\text{ctg}}\dfrac{{6\pi }}{5};\,\,\,{\text{ctg}}\dfrac{{2\pi }}{5}\)
5) \({\text{ctg}}\dfrac{{6\pi }}{5};\,\,\,\,{\text{ctg}}\dfrac{{3\pi }}{5};\,\,\,{\text{ctg}}\dfrac{{2\pi }}{5}\) 6) \({\text{ctg}}\dfrac{{6\pi }}{5};\,\,\,\,{\text{ctg}}\dfrac{{2\pi }}{5};\,\,\,{\text{ctg}}\dfrac{{3\pi }}{5}\)

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