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D( x )
(1/2)*x^3*y = 0
(1/2)*x^3*y = 0
(1/2)*x^3*y = 0
1/2*x^3*y = 0 // : 1/2*y
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x^7*y^2*((1/2)*x^3*y)^-2 = 0
24*x = 0 // : 24
x = 0
x in { 0}
x belongs to the empty set
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