Returns the hyperbolic cosine of a number! Is any real number !
计算数值的双曲余弦值。！任意实数。！
Returns the hyperbolic sine of a number! Is any real number!
返回数值的双曲正弦值。！任意实数！
In fact, an increasing number of papers are devoted to studying bifurcations of homoclinic or heteroclinic orbits with hyperbolic equilibria.
事实上，在已有的文献中，大部分同宿、异宿轨道分支问题都是考虑连接一个或两个双曲奇点的。
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