Function: cos(gradient[2](log(minus(numbers("xxy"), numbers('xry')) if minus(numbers("xxy"), numbers('xry')) if numbers('xry') > numbers("xxy") else numbers('rrr') > numbers('xry') else numbers("xxy"), minus(numbers("xxy"), numbers('xry')) if numbers("xxy") > numbers('xry') else numbers('rrr'))))
