3.C] Find the extreme values of the function 3.C] Find the extreme values of the function ๐(๐ฅ, ๐ฆ) = ๐ฅ 3 + 3๐ฅ๐ฆ 2 โ 3๐ฆ 2 โ 3๐ฅ 2 + 4