EC > GATE 2018 > Multivariable Calculus
Let f(x,y)=(ax2+by2)/xy where a and b are constants. If ∂f/∂x=∂f/∂y at x=1 and y=2, then the relation between a and b is
A
a=b/4
B
a=b/2
C
a=2b
D
a=4b

Correct : d

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