If (u = e^{ frac{(x^2+y^2)}{x+y}} ) Then, (x^2 frac{ ^2 u}{ x^2}+y^ – McqOptions

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1.	If (u = e^{ frac{(x^2+y^2)}{x+y}} ) Then, (x^2 frac{ ^2 u}{ x^2}+y^2 frac{ ^2 u}{ y}+2xy frac{ ^2 u}{ x y} )=?
A.	u ln u2061(u)
B.	u ln u2061(u)<sup>2</sup>
C.	u [1+ln u2061(u)]
D.	0
Answer» C. u [1+ln u2061(u)]

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