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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^3*((4*x^-1*y^3)/9)*y)^3)/2 = 0
32/729*x^6*y^12 = 0 // : 32/729*y^12
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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