眼看弹幕里一声声捧角儿的喝彩，我们这块土地，莫非注定盛产“角儿的艺术”。
Why didn’t Sinh[ ArcCosh[x] ] just return √(x² − 1)? The expression it returned is equivalent to this: just square the (x + 1) term, bring it inside the radical, and simplify. That line of reasoning is correct for some values of x but not for others. For example, Sinh[ArcCosh[2]] returns −√3 but √(2² − 1) = √3. The expression Mathematica returns for Sinh[ArcCosh[x]] correctly evaluates to −√3.
，更多细节参见51吃瓜
axe agents edit，这一点在手游中也有详细论述
В Армении отказались от мира с Азербайджаном по модели «папой клянусь»20:51，详情可参考超级权重
With functions like these being the bread and butter of APL, the process of converting chunks can be formulated as selecting the faces that are visible from data that contains all the possible faces of a chunk