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D( x )
12*x^-2 = 0
x = 0
12*x^-2 = 0
12*x^-2 = 0
12*x^-2 = 0 // : 12
x^-2 = 0
x naleu017Cy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((12*x^-2)^0)/6)*x^4*y^-3 = 0
(1/6)*x^4*y^-3 = 0
1/6*x^4*y^-3 = 0 // : 1/6*y^-3
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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