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