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D( x )
a-t = 0
a^2-(4*t^2) = 0
a-t = 0
a-t = 0
a-t = 0
x należy do R
a^2-(4*t^2) = 0
a^2-(4*t^2) = 0
a^2-4*t^2 = 0
a^2-4*t^2 = 0
x należy do R
x belongs to the empty set
(((a-(2*t))/(a-t))*(3*a-(3*t)))/(a^2-(4*t^2)) = 0
x belongs to the empty set
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