Function: gradient[2](product(minus(numbers("yyy") if numbers("xxr") > numbers('xry') else numbers('rrr') if numbers('rrr') > numbers("yyy") else numbers('xry'), numbers("yyy") if numbers('rrr') > numbers("xxr") else numbers('xry')), numbers('xry') if numbers("xxr") > numbers('rrr') else numbers("yyy") if numbers('xry') > numbers("yyy") else numbers('rrr')))
