lie on the same circle. If 
and 
,
,
or 11. However, I didn't know how to find the radius. Can anyone give me a hint?
and 
where each summation runs over 
variables 
and 
Then find the value of 
Y by
For non-negative real numbers x and y , if the inequality
x^2(y^2 + 9) + x^4y + 3y^2 \geq 27
holds, what is the minimum possible value of
x^2 + y
x^2(y^2 + 9) + x^4y + 3y^2 \geq 27
holds, what is the minimum possible value of
x^2 + y
and 
Prove that
,
.
