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。
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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