| Firebird Documentation Index → Firebird 2.5 Language Ref. Update → Internal functions → ACOS() |
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Available in: DSQL, PSQL
Added in: 2.1
Description: Returns the arc cosine of the argument.
Result type: DOUBLE PRECISION
Syntax:
ACOS (number)
The result is an angle in the range [0, π].
If the argument is outside the range [-1, 1], NaN is returned.
If the external function
ACOS is declared in your database, it will override the internal
function. To make the internal function available, DROP or ALTER the external
function (UDF).
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| Firebird Documentation Index → Firebird 2.5 Language Ref. Update → Internal functions → ACOS() |