Function: abs(minus(gradient[2](sum(numbers("xxy"), numbers('epe')) if numbers('epe') > numbers("xxy") if sum(numbers("xxy"), numbers('epe')) > numbers('epe') else numbers("xxr") else numbers("xxy")), numbers('epe') if numbers("xxy") > sum(numbers("xxy"), numbers('epe')) else numbers("xxr") if numbers('epe') > sum(numbers("xxy"), numbers('epe')) else numbers("xxy")))
