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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-3*((2*3*4*x*x^2*x^2*y^4*y^4)/3)*y^2 = 0
8*x^2*y^10 = 0 // : 8*y^10
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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