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D( x )
(10*x^2)/y = 0
x^2 = 0
(10*x^2)/y = 0
(10*x^2)/y = 0
10*x^2*y^-1 = 0 // : 10*y^-1
x^2 = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((5*x^6)/(x^2))*y)/((10*x^2)/y) = 0
1/2*x^2*y^2 = 0 // : 1/2*y^2
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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