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[Roberto Spadim <roberto@xxxxxxxxxxxxx>]

from mysql 5.1, 5.5, 5.6, 5.7 manual
http://dev.mysql.com/doc/refman/5.1/en/mathematical-functions.html#function_cot
http://dev.mysql.com/doc/refman/5.5/en/mathematical-functions.html#function_cot
http://dev.mysql.com/doc/refman/5.6/en/mathematical-functions.html#function_cot
http://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_cot
*
*

   -

    COT(*X*)<http://dev.mysql.com/doc/refman/5.1/en/mathematical-functions.html#function_cot>

   Returns the cotangent of *X*.

   mysql> *SELECT COT(12);*
           -> -1.5726734063977
   mysql> *SELECT COT(0);*
           -> NULL




maybe a sql_mode parameter change the output of this function?