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D( x )
x^4 = 0
x = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-1*((2*x^6*y^-2)/(x^4))*y^6*((3*x^1*y^4)/4)*y^-6 = 0
x^-1*((2*x^6*y^-2)/(x^4))*y^6*((3*x*y^4)/4)*y^-6 = 0
3/2*x^2*y^2 = 0 // : 3/2*y^2
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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