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D( x )
y^8 = 0
(x^4)/(y^8) < 0
y^8 = 0
y^8 = 0
y^8 = 0
x należy do R
(x^4)/(y^8) < 0
(x^4)/(y^8) < 0
(x^4)/(y^8) = 0
x^4*y^-8 = 0 // : y^-8
x^4 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
x belongs to the empty set
((x^4)/(y^8))^(1/2) = 0
x belongs to the empty set
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