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Question

If xy+yx=1,(x,y0), then value of x3y3 is:

A
1
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B
1
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C
0
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D
None of these
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Solution

The correct option is D 0
if xy+yx=1
simplifies to x2+xy+y2=0
as (x3y3)=(xy)(x2+xy+y2)=0 using above result

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