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D( x )
x^6 = 0
x*((16*y^2)/3) = 0
x^6 = 0
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x*((16*y^2)/3) = 0
x*((16*y^2)/3) = 0
16/3*x*y^2 = 0 // : 16/3*y^2
x = 0
x in (-oo:0) U (0:+oo)
((4*y^4)/(x^6))/(x*((16*y^2)/3)) = 0
3/4*x^-7*y^2 = 0 // : 3/4*y^2
x^-7 = 0
x naleu017Cy do O
x belongs to the empty set
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