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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^3*((4*x^-2*y^4)/8)*(y^-2)^3 = 0
1/2*x*y^-2 = 0 // : 1/2*y^-2
x = 0
x in { 0}
x belongs to the empty set
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