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D( x )
x*((8*x^-3*y^2)/5) = 0
x = 0
x*((8*x^-3*y^2)/5) = 0
x*((8*x^-3*y^2)/5) = 0
8/5*x^-2*y^2 = 0 // : 8/5*y^2
x^-2 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x*((8*x^-3*y^2)/5))^-3*(4*x^3*y^3)^4 = 0
125/2*x^18*y^6 = 0 // : 125/2*y^6
x^18 = 0
x = 0
x in { 0}
x belongs to the empty set
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