If f (x, y) = x3y – xy3, then what is the value of \(\left[ {\frac{1}{{\frac{{{\rm{df}}}}{{{\rm{dx}}}}}}{\rm{\;}} + \frac{1}{{\frac{{{\rm{df}}}}{{{\rm{dy}}}}}}} \right]\) x = 1, y = 2?

If f (x, y) = x3y – xy3, then what is the value of \(\left[ {\frac{1

1.	If f (x, y) = x3y – xy3, then what is the value of \(\left[ {\frac{1}{{\frac{{{\rm{df}}}}{{{\rm{dx}}}}}}{\rm{\;}} + \frac{1}{{\frac{{{\rm{df}}}}{{{\rm{dy}}}}}}} \right]\) x = 1, y = 2?
A.	13/18
B.	-9/18
C.	9/22
D.	-13/22
Answer» E.

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If f (x, y) = x3y – xy3, then what is the value of \(\left[ {\frac{1}{{\frac{{{\rm{df}}}}{{{\rm{dx}}}}}}{\rm{\;}} + \frac{1}{{\frac{{{\rm{df}}}}{{{\rm{dy}}}}}}} \right]\) x = 1, y = 2?

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