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Question

If xy+yx=2,x0,y0, find x3y3.

A
0
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B
1
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C
1
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D
xy
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Solution

The correct option is C 0
xy+yx=2x2+y2=2xy
x22xy+y2=0(xy)2=0
So, (xy)=0x=y
x3y3=0

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