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x 2 + y 2 + rx 2 r 2 x 2 + y 2
x 2 + y 2 r 2
x 2 + y 2 + z 2 r 2
x 2 +y 2 +z 2 2 2 x y
what is x 2+y 2 r 2
x 2+y 2 2 a 2 x 2-y 2
y 2 x y 2 -x
x 2+y 2 x 2y 2
x 2+y 2 2rx
r x y x 2+y 2+1
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