Function: tan(minus(round(numbers("per") if numbers("per") > numbers('epe') else numbers('xyy') if numbers("per") > numbers("per") else numbers('xyy'), numbers("per") if numbers("per") > numbers('epe') else numbers('xyy')), numbers('epe') if numbers("per") > numbers('xyy') else numbers("per") if numbers("per") > numbers('xyy') else numbers("per")))
