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D( x )
x^3*((-2*y^4)/5) = 0
x^3*((-2*y^4)/5) = 0
x^3*((-2*y^4)/5) = 0
-2/5*x^3*y^4 = 0 // : -2/5*y^4
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^3*((-2*y^4)/5))^-2 = 0
25/4*x^-6*y^-8 = 0 // : 25/4*y^-8
x^-6 = 0
x należy do O
x belongs to the empty set
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