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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t^2-(2/t) = 0
t^2-2*t^-1 = 0
t^2-2*t^-1 = 0
t^-1*(t^3-2) = 0
1*t^3 = 2 // : 1
t^3 = 2
t^3 = 2 // ^ 1/3
t = 2^(1/3)
1/t = 0
1*t^-1 = 0 // : 1
t^-1 = 0
t należy do O
t = 2^(1/3)
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