x4y4 + x4 + y4 + 1 - 4x2y2 = 0. (x4y4 - 2x2y2 + 1) + (x4 - 2x2y2 + y4) = 0
(x2y2-1)2 + (x2-y2)2 = 0 .
( x2y2=1.
( x2=y2. x=y=1. (1;1), (- 1; - 1), (1; - 1), (- 1;1).
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x4y4 + x4 + y4 + 1 - 4x2y2 = 0. (x4y4 - 2x2y2 + 1) + (x4 - 2x2y2 + y4) = 0
(x2y2-1)2 + (x2-y2)2 = 0 .
( x2y2=1.
( x2=y2. x=y=1. (1;1), (- 1; - 1), (1; - 1), (- 1;1).