TAN

描述

返回 x 的正切值，x 为弧度值

语法

TAN(<x>)

参数

参数	说明
<x>	需要被计算正切值的值

返回值

返回 x 的正切值

特殊情况

• 当 x 为 NaN，返回 NaN
• 当 x 为正无穷或负无穷（±Infinity），返回 NaN
• 当 x 为 NULL，返回 NULL

举例

select tan(0),tan(1),tan(-1);

+------------------------+------------------------+-------------------------+
| tan(cast(0 as DOUBLE)) | tan(cast(1 as DOUBLE)) | tan(cast(-1 as DOUBLE)) |
+------------------------+------------------------+-------------------------+
|                      0 |     1.5574077246549023 |     -1.5574077246549023 |
+------------------------+------------------------+-------------------------+

select tan(cast('nan' as double));

+---------------------------+
| tan(cast('nan' AS DOUBLE))|
+---------------------------+
| NaN                       |
+---------------------------+

select tan(cast('inf' as double));

+---------------------------+
| tan(cast('inf' AS DOUBLE))|
+---------------------------+
| NaN                       |
+---------------------------+

select tan(cast('-inf' as double));

+----------------------------+
| tan(cast('-inf' AS DOUBLE))|
+----------------------------+
| NaN                        |
+----------------------------+