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Oracle® Database SQL Language Reference
12c Release 1 (12.1)

E17209-15
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ACOS

Syntax

Description of acos.gif follows
Description of the illustration acos.gif

Purpose

ACOS returns the arc cosine of n. The argument n must be in the range of -1 to 1, and the function returns a value in the range of 0 to pi, expressed in radians.

This function takes as an argument any numeric data type or any nonnumeric data type that can be implicitly converted to a numeric data type. If the argument is BINARY_FLOAT, then the function returns BINARY_DOUBLE. Otherwise the function returns the same numeric data type as the argument.

See Also:

Table 2-10, "Implicit Type Conversion Matrix" for more information on implicit conversion

Examples

The following example returns the arc cosine of .3:

SELECT ACOS(.3)"Arc_Cosine"
  FROM DUAL;

Arc_Cosine
----------
1.26610367