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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.

func.abs( <x> )
func.abs(1)
┌──────────────┐
│ func.acos(1) │
├──────────────┤
0
└──────────────┘
ACOS( <x> )
SELECT ACOS(1);
┌─────────┐
acos(1) │
├─────────┤
0
└─────────┘