类别：: 数值函数（三角函数）

COT¶

计算其实参的余切值；实参应以弧度表示。

语法¶

COT( <input_expr> )

实参¶

input_expr: The value or expression to operate on. The data type must be FLOAT.

返回¶

This function returns a value of type FLOAT.

示例¶

SELECT COT(0), COT(PI()/3), COT(RADIANS(90));

+--------+--------------+------------------+
| COT(0) |  COT(PI()/3) | COT(RADIANS(90)) |
|--------+--------------+------------------|
|    inf | 0.5773502692 |  6.123233996e-17 |
+--------+--------------+------------------+