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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^-3*y)/(2^-4))^4 = 0
1048576*x^-12*y^4 = 0 // : 1048576*y^4
x^-12 = 0
x należy do O
x belongs to the empty set
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