Tan
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Returns the tangent of <x>. If <x> is greater than or equal to 263, or less than or equal to -263, there is a loss of significance in the result of the call, and the function generates a _TLOSS error and returns a zero.
DECLARE EXTERNAL FUNCTION TAN DOUBLE PRECISION RETURNS DOUBLE PRECISION BY VALUE ENTRY_POINT 'IB_UDF_tan' MODULE_NAME 'ib_udf';