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D( y )
y = 0
(2*y^-1)/5 = 0
y = 0
y = 0
(2*y^-1)/5 = 0
(2*y^-1)/5 = 0
2/5*y^-1 = 0 // : 2/5
y^-1 = 0
y należy do O
y in (-oo:0) U (0:+oo)
(4*y)/((2*y^-1)/5) = 0
10*y^2 = 0 // : 10
y^2 = 0
y = 0
y in { 0}
y belongs to the empty set
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