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D( x )
t^2 = 0
d^(2^2) = 0
t^2 = 0
t^2 = 0
t^2 = 0
x należy do R
d^(2^2) = 0
d^(2^2) = 0
d^4 = 0
x należy do R
x belongs to the empty set
(T^1)/(t^2) = (d^(1^2))/(d^(2^2))
x belongs to the empty set
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