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Q.

If xy(yx)=16 then y has a minimum value when x =

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a

2

b

1

c

3

d

4

answer is C.

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Detailed Solution

xy(yx)=16xy2x2y=16y2+2xydydxx2dydx2xy=0dydx=2xyy22xyx2
for maxima or minima dydx=0
2xyy2=0y=0,y=2xxy(yx)=162x2(2xx)=16x3=8x=2
 

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