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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^4*((3*x^-2*y^3)/6)*y^-2 = 0
1/2*x^2*y = 0 // : 1/2*y
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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