If the function \(u = \ln \left( {\frac{{{x^3} + {x^2}y - {y^3}}}{{x - y}}} \right)\) then \(x\frac{{\delta u}}{{\delta x}} + y\frac{{\delta u}}{{\delta y}}\) is

If the function \(u = \ln \left( {\frac{{{x^3} + {x^2}y - {y^3}}}{{x -

1.	If the function \(u = \ln \left( {\frac{{{x^3} + {x^2}y - {y^3}}}{{x - y}}} \right)\) then \(x\frac{{\delta u}}{{\delta x}} + y\frac{{\delta u}}{{\delta y}}\) is
A.	2eu
B.	e2u
C.	2
D.	1/2
Answer» D. 1/2

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If the function \(u = \ln \left( {\frac{{{x^3} + {x^2}y - {y^3}}}{{x - y}}} \right)\) then \(x\frac{{\delta u}}{{\delta x}} + y\frac{{\delta u}}{{\delta y}}\) is

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