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D( x )
(2*x^4*y^3)^2 = 0
(2*x^4*y^3)^2 = 0
(2*x^4*y^3)^2 = 0
4*x^8*y^6 = 0 // : 4*y^6
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
((4*x^5*y^4)^3)/((2*x^4*y^3)^2) = 0
16*x^7*y^6 = 0 // : 16*y^6
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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