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D( x )
12*x^2*y^5 = 0
12*x^2*y^5 = 0
12*x^2*y^5 = 0
12*x^2*y^5 = 0 // : 12*y^5
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x^3*y^2)/(12*x^2*y^5) = 0
1/3*x*y^-3 = 0 // : 1/3*y^-3
x = 0
x in { 0}
x belongs to the empty set
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