sqrt(x^2/y)+sqrt(y/x^2)=2
sqrt((x^2/y)=t
t+1/t=2
(t-1)^2=0
t=1
x^2/y=1
x^2=y
y-x=12
x^2-x-12=0
x1=-3 x2=4
y1=9 y2=16
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