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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.27 = (x/(-x))^2 // - (x/(-x))^2
0.27-(x/(-x))^2 = 0
-0.73 = 0
x belongs to the empty set
x belongs to the empty set
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