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