Finally, let's take care of the inverse trig and hyperbolicfunctions.
最后，让我们的双曲函数反三角函数和照顾。
2
The hyperbolic trigonometric functions are to hyperbolae as the trigonometric functions are to circles. That is, imagine you plot these points on a Cartesian plane for all possible values of t.
双曲三角函数就是对曲线应用三角函数，也就是说，想象将这些点放在笛卡尔平面上来得到t的所有可能值。
3
The coefficient functions of the hyperbolic equations considered are assumed to be piecewise constant.