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2 x + y 3 – 2x + 4 ÷ y
x 4+y 4 a 2 x 2+y 2
x 2+y 2 4 x 2-y 2
x 2+y 2 x 4+y 4
x 2+y 2 3 x 4+y 4
y 4 1 + x4 y 2x2
x 2 4x+2y y 2 2x+4y
x+4 y-2 2 y y+4 x-2 2
x 2+y 2 4
2x-y 4 -x+2y 4
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