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D( x )
12*x^-2*y^5 = 0
x = 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 naleu017Cy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(36^3*y^8)/(12*x^-2*y^5) = 0
3888*x^2*y^3 = 0 // : 3888*y^3
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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