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F_ARCOTH

function from adhoc

Entrypoint arccoth compatible with UTF-8

This function calculates the AreaCotangensHyperbolicus

Syntax

   Entrypoint	arccoth	compatible with UTF-8
   TestSQL
   SELECT 1 AS ISCORRECT, F_SIN(1.5707963267949), F_SIN(F_DEGTORAD(90)), F_SIND(90) FROM RDB$DATABASE;
   SELECT NULL AS ISCORRECT, F_SIN(NULL) FROM RDB$DATABASE;