ACOS

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The ACOS function returns the arc cosine of the argument as an angle expressed in radians. The ACOS and COS functions are inverse operations.

expression
The argument must be an expression that returns a value of any built-in numeric, character-string, or graphic-string data type. A string argument is cast to double-precision floating point before evaluating the function. For more information on converting strings to double-precision floating point, see DOUBLE_PRECISION or DOUBLE. The value must be greater than or equal to -1 and less than or equal to 1.

The data type of the result is double-precision floating point. If the argument can be null, the result can be null; if the argument is null, the result is the null value.

The result is greater than or equal to 0 and less than or equal to .

Example