asin

description

Syntax

DOUBLE asin(DOUBLE x) 返回x的反正弦值，若 x不在-1到 1的范围之内，则返回 nan.

example

1. mysql> select asin(0.5);
2. +---------------------+
3. | asin(0.5)           |
4. +---------------------+
5. | 0.52359877559829893 |
6. +---------------------+
7. mysql> select asin(2);
8. +-----------+
9. | asin(2.0) |
10. +-----------+
11. |       nan |
12. +-----------+

keywords

1. ASIN