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D( x )
25*y^16 = 0
(4*x^8)/(25*y^16) < 0
25*y^16 = 0
25*y^16 = 0
25*y^16 = 0
x należy do R
(4*x^8)/(25*y^16) < 0
(4*x^8)/(25*y^16) < 0
(4*x^8)/(25*y^16) = 0
4/25*x^8*y^-16 = 0 // : 4/25*y^-16
x^8 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
x belongs to the empty set
((4*x^8)/(25*y^16))^0.5 = 1
x belongs to the empty set
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