If ๐‘ข = ๐‘“(๐‘ฅ โˆ’ ๐‘ฆ, ๐‘ฆ โˆ’ ๐‘ง, ๐‘ง โˆ’ ๐‘ฅ) show that

4.B] If ๐‘ข = ๐‘“(๐‘ฅ โˆ’ ๐‘ฆ, ๐‘ฆ โˆ’ ๐‘ง, ๐‘ง โˆ’ ๐‘ฅ) show that ๐œ•๐‘ข/๐œ•๐‘ฅ + ๐œ•๐‘ข/๐œ•๐‘ฆ +๐œ•๐‘ข/๐œ•๐‘ง = 0

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