Answer
x$^4$+2x$^2$y$^2$+y$^4$
Work Step by Step
(A+B)$^2$=A$^2$+2AB+B$^2$
(x$^2$+y$^2$)$^2$
(x$^2$)$^2$+2(x$^2$)(y$^2$)+(y$^2$)$^2$
x$^4$+2x$^2$y$^2$+y$^4$
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