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MariaDB ACOS() Function



The MariaDB ACOS() function returns arc cosine of a value. The returned value will be in the range 0 through 𝜋. In special cases it returns the following:

  • If the number is not within the range of -1 to 1, then NULL is returned.

Note: ACOS() is the inverse of COS().

Syntax

ACOS(x)

Parameters

x Required. Specify the value.

Return Value

Returns the arc cosine of the value.

Example 1:

The example below shows the usage of ACOS() function.

SELECT ACOS(0.2);
Result: 1.369438406004566

SELECT ACOS(0.8);
Result: 0.6435011087932843

SELECT ACOS(1);
Result: 0

SELECT ACOS(-1);
Result: 3.141592653589793

SELECT ACOS(0);
Result: 1.5707963267948966

SELECT ACOS(-0.2);
Result: 1.7721542475852274

SELECT ACOS(-2);
Result: NULL

Example 2:

Consider a database table called Sample with the following records:

Datax
Data 1-1
Data 2-0.5
Data 30
Data 40.5
Data 51

The statement given below can be used to calculate the arc cosine of records of column x.

SELECT *, ACOS(x) AS ACOS_Value FROM Sample;

This will produce the result as shown below:

DataxACOS_Value
Data 1-13.141592653589793
Data 2-0.52.0943951023931957
Data 301.5707963267948966
Data 40.51.0471975511965979
Data 510

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