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D( x )
(s^2)/t = 0
t^2 = 0
(s^2)/t = 0
(s^2)/t = 0
s^2*t^-1 = 0
x należy do R
t^2 = 0
t^2 = 0
t^2 = 0
x należy do R
x belongs to the empty set
(s/(t^2))/((s^2)/t) = 0
x belongs to the empty set
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