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D( x )
x = 0
(4*x^4*y^-1)^5 = 0
x^-4*y = 0
x = 0
x = 0
(4*x^4*y^-1)^5 = 0
(4*x^4*y^-1)^5 = 0
1024*x^20*y^-5 = 0 // : 1024*y^-5
x^20 = 0
x = 0
x^-4*y = 0
x^-4*y = 0
x^-4*y = 0 // : y
x^-4 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((x^-4*y)^-5)/((4*x^4*y^-1)^5) = 0
1/1024 = 0
x belongs to the empty set
x belongs to the empty set
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