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D( x )
x^5*((x^2*y)/4) = 0
x^5*((x^2*y)/4) = 0
x^5*((x^2*y)/4) = 0
1/4*x^7*y = 0 // : 1/4*y
x^7 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^5*((x^2*y)/4))^-2 = 0
16*x^-14*y^-2 = 0 // : 16*y^-2
x^-14 = 0
x należy do O
x belongs to the empty set
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