1·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。