(x 2 + y 2 - z 2 ) 2 - (x 2 - y 2 + z 2 ) 2 = ________

1
4x 2 y 2 - 4x 2 z 2
2
4x 2 y 2 z 2
3
x 4 + y 4 + z 4
4
0

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