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Q.

Let A= (x, y) : x>0, y>0, x2+y2=1 and let B=(x,y):x>0,y>0,x6+y6=1 Then A∩B

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a

A

b

B

c

d

{(0,1),(1,0)}

answer is C.

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Detailed Solution

x6+y6=x2+y2x4−x2y2+y4, so if (x,y)A∩B then 1=x4−x2y2+y4=x2+y22−3x2y2                  =1−3x2y2⇒x2y2=0 x=0 or y=0 but x>0,y>0 so A∩B=ϕ
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Let A= (x, y) : x>0, y>0, x2+y2=1 and let B=(x,y):x>0,y>0,x6+y6=1 Then A∩B