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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^-4)/3)*x^-2*y^4 = 0
2/3*x^-6*y^4 = 0 // : 2/3*y^4
x^-6 = 0
x naleu017Cy do O
x belongs to the empty set
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