双曲正弦函数在数学语言上一般记作sinh，也可简写成sh。 与三角函数一样，双曲函数也分为双曲正弦、双曲余弦、双曲正切、双曲余切、双曲正割、双曲余割6种，双曲正弦函数和双曲余弦函数是双曲函数中最基本的两种，由这两个函数可推导出双曲正切函数等等。

sinh 、 cosh 和 tanh csch 、 sech 和 coth. 最簡單的幾種雙曲函數為 [1] ： 雙曲正弦： = 雙曲餘弦： = + 雙曲正切：

Also, similarly to how the derivatives of sin(t) and cos(t) are cos(t) and –sin(t) respectively, the derivatives of sinh(t) and cosh(t) are cosh(t) and sinh(t) respectively. Hyperbolic functions are used to express the angle of parallelism in hyperbolic geometry .

三角函数有反三角函数，就是三角函数的逆函数，双曲函数也有，下面是sinh、cosh、tanh的反函数图像： 并且我们是可以求出各个反双曲函数的对数表示式的：

The two basic hyperbolic functions are "sinh" and "cosh": Hyperbolic Sine: sinh(x) = e x − e-x 2 (pronounced "shine") Hyperbolic Cosine: cosh(x) = e x + e-x 2 (pronounced "cosh") They use the natural exponential function e x. And are not the same as sin(x) and cos(x), but a little bit similar: sinh vs sin. cosh vs cos. Catenary

在数学中，双曲函数是一类与常见的三角函数（也叫圆函数）类似的函数。最基本的双曲函数是双曲正弦函数sinh和双曲余弦函数cosh，从它们可以导出双曲正切函数tanh等，其推导也类似于三角函数的推导。双曲函数的反函数称为反双曲函数。

If x = sinh y, then y = sinh-1 a is called the inverse hyperbolic sine of x. Similarly we define the other inverse hyperbolic functions. The inverse hyperbolic functions are multiple-valued and as in the case of inverse trigonometric functions we restrict ourselves to principal values for which they can be considered as single-valued.

2023年5月15日 · 双曲正弦一般以sinh表示 [1] ，在部分较旧的文献中有时会以 表示。 [2]

\sinh \frac{x}{2}=\pm \sqrt{\frac{\cosh x-1}{2}}\left(\begin{array}{l} x>0, \qquad \text{取正号} \\ x<0,\qquad \text{取负号} \end{array} \right)\\ \cosh \frac{x}{2}=\sqrt{\frac{\cosh x+1}{2}} \\ \tanh …

sinh 、 cosh 和 tanh （就是双曲正弦、双曲余弦和双曲正切） sinh x = e x − e −x 2. cosh x = e x + e −x 2. tanh x = sinh x cosh x = e x − e −x e x + e −x. 导数. 这些函数的导数是： d dx sinh x = cosh x. d dx cosh x = sinh x. d dx tanh x = 1 − tanh 2 x