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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-4*((4*x^-2*y^2)/12)*y^-1)^3 = 0
1/27*x^-18*y^3 = 0 // : 1/27*y^3
x^-18 = 0
x naleu017Cy do O
x belongs to the empty set
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