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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((2^6*x^-12*y^3)^1)/3 = 0
(2^6*x^-12*y^3)/3 = 0
64/3*x^-12*y^3 = 0 // : 64/3*y^3
x^-12 = 0
x należy do O
x belongs to the empty set
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