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D( x )
x < 0
((-2*x^(2^-3))/4)*y^4 = 0
x < 0
((-2*x^(2^-3))/4)*y^4 = 0
((-2*x^(2^-3))/4)*y^4 = 0
-1/2*x^(1/8)*y^4 = 0 // : -1/2*y^4
x^(1/8) = 0
x = 0
x in (0:+oo)
(((-2*x^(2^-3))/4)*y^4)^-3 = 0
-8*x^(-3/8)*y^-12 = 0 // : -8*y^-12
x^(-3/8) = 0
x należy do O
x belongs to the empty set
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