http://beobahter.livejournal.com/ ([identity profile] beobahter.livejournal.com) wrote in [personal profile] gb0 2017-02-08 04:32 pm (UTC)

Сколько - 180

Как - тупо посчитал на Матлабе

acos(1/sqrt(10))+acos(1/sqrt(5))+pi/4

Но это, конечно, не метод, буду еще думать :)

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