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Syntax: ACOS(X) Returns the arc cosine of X, that is, the value whose cosine is X. Returns NULL if X is not in the range -1 to 1. URL: https://mariadb.com/kb/en/acos/
Example:
MariaDB> SELECT ACOS(1); -> 0 MariaDB> SELECT ACOS(1.0001); -> NULL MariaDB> SELECT ACOS(0); -> 1.5707963267949