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D( x )
12*x^-2 = 0
x = 0
6*x^4*y^-3 = 0
12*x^-2 = 0
12*x^-2 = 0
12*x^-2 = 0 // : 12
x^-2 = 0
x należy do O
x = 0
x = 0
6*x^4*y^-3 = 0
6*x^4*y^-3 = 0
6*x^4*y^-3 = 0 // : 6*y^-3
x^4 = 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 należy do O
x belongs to the empty set
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