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Let f(x,y)=xln(y)4xy+xf ( x , y ) = x \ln ( y ) - 4 x y + x

Question 68

Multiple Choice

Let f(x,y) =xln(y) 4xy+xf ( x , y ) = x \ln ( y ) - 4 x y + x . Then fy(x,y) f _ { y } ( x , y ) is


A) x(1+4y) y\frac { x ( 1 + 4 y ) } { y }
B) x(14y) y\frac { x ( 1 - 4 y ) } { y }
C) x(14y) y- \frac { x ( 1 - 4 y ) } { y }
D) y(14y) x\frac { y ( 1 - 4 y ) } { x }
E) y(1+4y) x\frac { y ( 1 + 4 y ) } { x }

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