Classify the following partial differential equations

Classify the following partial differential equations
(i) ๐‘ข๐‘ฅ๐‘ฅ + 4๐‘ข๐‘ฅ๐‘ฆ + 4๐‘ข๐‘ฆ๐‘ฆ โˆ’ ๐‘ข๐‘ฅ + 2๐‘ข๐‘ฆ = 0
(ii) ๐‘ฅ2๐‘ข๐‘ฅ๐‘ฅ + (1 โˆ’ ๐‘ฆ2)๐‘ข๐‘ฆ๐‘ฆ = 0 ,โˆ’1 < ๐‘ฆ < 1
(iii) (1 + ๐‘ฅ2)๐‘ข๐‘ฅ๐‘ฅ + (5 + 2๐‘ฅ2)๐‘ข๐‘ฅ๐‘ก + (4 + ๐‘ฅ2)๐‘ข๐‘ก๐‘ก = 0
(iv) ๐‘ฆ2๐‘ข๐‘ฅ๐‘ฅ โˆ’ 2๐‘ฆ๐‘ข๐‘ฅ๐‘ฆ + ๐‘ข๐‘ฆ๐‘ฆ โˆ’ ๐‘ข๐‘ฆ = 8๐‘ฆ

Answer:-

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