# 三角函数与常数

### 数学常数

| 名称         | 值               |
| ---------- | --------------- |
| Pi 或 π     | 3.1415926536…   |
| Tau (2pi)  | 6.2831853072... |
| Phi (黄金比例) | 1.6180339887... |

### 三角函数

| 函数      | 描述         |
| ------- | ---------- |
| sin()   | 计算值的正弦值    |
| sinh()  | 计算值的双曲正弦值  |
| asinh() | 计算值的双曲反正弦值 |
| cos()   | 计算值的余弦值    |
| cosh()  | 计算值的双曲余弦值  |
| acosh() | 计算值的双曲反余弦值 |
| tan()   | 计算值的正切值    |
| tanh()  | 计算值的双曲正切值  |
| atanh() | 计算值的双曲反正切值 |

{% hint style="info" %}
三角函数默认接受弧度制的值。

如果您想使用度数制，请在参数中指定，或在函数名后追加 "d":

sin(90 degrees) = 1.0

sind(90) = 1.0
{% endhint %}

### 反三角函数

| 函数     | 描述       |
| ------ | -------- |
| asin() | 计算值的反正弦值 |
| acos() | 计算值的反余弦值 |
| atan() | 计算值的反正切值 |

{% hint style="info" %}
反三角函数默认返回弧度制的值。

如果您想使用度数制，请在参数中指定，或在函数名后追加 "d":

asin(0.5 degrees) = 30º

asind(0.5) = 30º
{% endhint %}


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