Once we’ve defined arccosh and square root carefully, we can see that the expressions Mathematica returns for sinh(arccosh(x)) and tanh(arccosh(x)) are correct for all complex inputs, while the simpler expressions in the table above implicitly assume we’re working with values of x for which arccosh(x) is real.
pip install -r requirements.txt
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阿尔茨海默病是老年人最常见的痴呆，主要表现为记性越来越差、认不出家人、生活慢慢不能自理，给患者和家庭都带来沉重负担。这种病在大脑里先出现异常蛋白堆积，再引发神经损伤，导致认知功能持续下降。
Фото: Ирина Бужор / Коммерсантъ
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