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D( x )
-2*x^4*y^2 = 0
-2*x^4*y^2 = 0
-2*x^4*y^2 = 0
-2*x^4*y^2 = 0 // : -2*y^2
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x^11*y^4)/(-2*x^4*y^2) = 0
-3*x^7*y^2 = 0 // : -3*y^2
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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