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D( y )
y = 0
y < 0
y^-2 = 0
y = 0
y = 0
y < 0
y^-2 = 0
y^-2 = 0
1*y^-2 = 0 // : 1
y^-2 = 0
y należy do O
y in (0:+oo)
((y^-3*y^0.5*y^6)/(y^-2))*y^7 = 0
1*y^12.5 = 0 // : 1
y^12.5 = 0
y = 0
y in { 0}
y belongs to the empty set
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