---
title: "asin | open.mp"
description: "获取正弦值的反正弦角度（以度为单位）"
canonical: https://omp.itsneufox.com/zh-CN/docs/scripting/functions/asin
language: zh-CN
---

# asin

## 描述

计算指定正弦值的反正弦角度（以度为单位）。在三角函数中，反正弦是正弦的逆运算。

| 参数 | 说明 |
| --- | --- |
| Float:value | 需要计算反正弦值的数值，取值范围\[-1, +1\] |

## 返回值

以度为单位的反正弦角度，取值范围\[-90.0, +90.0\]。

## 示例

```c
// 数值0.500000的反正弦值为30.000000度

public OnGameModeInit()
{
    new Float:param, Float:result;
    param = 0.5;
    result = asin(param);
    printf("数值%f的反正弦值为%f度", param, result);
    return 1;
}
```

## 相关函数

-   [floatsin](https://omp.itsneufox.com/zh-CN/docs/scripting/functions/floatsin): 获取指定角度的正弦值
-   [floatcos](https://omp.itsneufox.com/zh-CN/docs/scripting/functions/floatcos): 获取指定角度的余弦值
-   [floattan](https://omp.itsneufox.com/zh-CN/docs/scripting/functions/floattan): 获取指定角度的正切值
-   [acos](https://omp.itsneufox.com/zh-CN/docs/scripting/functions/acos): 计算反余弦角度值
-   [atan](https://omp.itsneufox.com/zh-CN/docs/scripting/functions/atan): 计算反正切角度值
-   [atan2](https://omp.itsneufox.com/zh-CN/docs/scripting/functions/atan2): 计算多值反正切角度值