The COT function returns the cotangent value of the argument x. That is, it returns a value whose tangent is x in radian. The return value is a DOUBLE type.
COT ( x )
SELECT COT(1), COT(-1), COT(0);
cot(1) cot(-1) cot(0)
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6.420926159343306e-01 -6.420926159343306e-01 NULL