Computes the inverse cosine (arc cosine) of its input; the result is a number in the interval [0, pi].
real_expr
This expression should evaluate to a real number greater than or equal to -1.0 and less than or equal to +1.0.
The data type of the return value is FLOAT.
Returns the arc cosine in radians (not degrees) as a value in the range [0, pi].
SELECT ACOS(0), ACOS(0.5), ACOS(1); +-------------+-------------+---------+ | ACOS(0) | ACOS(0.5) | ACOS(1) | |-------------+-------------+---------| | 1.570796327 | 1.047197551 | 0 | +-------------+-------------+---------+
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