Какое из следующих равенств верно для заданной функции двух переменных?<img src="/close/store/examRes/%7B43A984B8-548B-42C4-A422-B59D90CE3C67%7D/%D1%87%D0%B0%D1%81%D1%82%D0%BD%D1%8B%D0%B5%20%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%BE%D0%B4%D0%BD%D1%8B%D0%B5%202.png" /> <img src="/close/store/examRes/%7B43A984B8-548B-42C4-A422-B59D90CE3C67%7D/%D1%87%D0%B0%D1%81%D1%82%D0%BD%D1%8B%D0%B5%20%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%BE%D0%B4%D0%BD%D1%8B%D0%B5%20%D0%BE%D1%82%D0%B2%D0%B5%D1%82%201.png" />, <img src="/close/store/examRes/%7B43A984B8-548B-42C4-A422-B59D90CE3C67%7D/%D1%87%D0%B0%D1%81%D1%82%D0%BD%D1%8B%D0%B5%20%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%BE%D0%B4%D0%BD%D1%8B%D0%B5%20%D0%BE%D1%82%D0%B2%D0%B5%D1%82%202.png" />, <img src="/close/store/examRes/%7B43A984B8-548B-42C4-A422-B59D90CE3C67%7D/%D1%87%D0%B0%D1%81%D1%82%D0%BD%D1%8B%D0%B5%20%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%BE%D0%B4%D0%BD%D1%8B%D0%B5%20%D0%BE%D1%82%D0%B2%D0%B5%D1%82%203.png" />, <img src="/close/store/examRes/%7B43A984B8-548B-42C4-A422-B59D90CE3C67%7D/%D1%87%D0%B0%D1%81%D1%82%D0%BD%D1%8B%D0%B5%20%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%BE%D0%B4%D0%BD%D1%8B%D0%B5%20%D0%BE%D1%82%D0%B2%D0%B5%D1%82%204.png" />