ASIN

Function Description

The asin function is used to calculate the arcsine of a given number, which is the angle whose sine is equal to the given value. This function is widely used in fields such as mathematics, physics, and engineering.

Syntax

asin(expr)

Parameters

• expr: The value for which the arcsine needs to be calculated, of type double.

Return Value

Returns the calculated arcsine value, of type double.

Usage Instructions

• When the value of expr is between -1 and 1 (inclusive of -1 and 1), the asin function can return a valid arcsine value.
• When the value of expr is less than -1 or greater than 1, the asin function will return NaN (Not a Number).

Example

-- Calculate the arcsine of 0
> SELECT asin(0);
0.0

-- Calculate the arcsine of 0.5
> SELECT asin(0.5);
0.5235987755982989

-- Calculate the arcsine of -1
> SELECT asin(-1);
-1.5707963267948966

-- Calculate the arcsine of a value greater than 1, returns NaN
> SELECT asin(2);
NaN

Through the above examples, you can see the application of the asin function in different scenarios. Please note that when the input value is not within the range of -1 to 1, the function will return NaN. In practical applications, please ensure that the input values are within the valid range to avoid errors.