lxe: (hardware acceleration)
стриш-ш-ш (ш-ш-ш!) ([personal profile] lxe) wrote in [personal profile] gb0 2017-02-08 11:44 pm (UTC)


tg(a+b) = (tg(a) + tg(b)) / (1 - tg(a)*tg(b))
tg(y+z) = (2 + 3) / (1 - 2 * 3) = 5 / (-5) = -1
Поскольку y и z острые, отрицательный тангенс их суммы приземляется во второй квадрант и равен 3*π/4.
Прибавляя x=π/4, получаем π.

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