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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
3*t^2-((7*t^-1)/2) = 0
3*t^2+(-7/2)*t^-1 = 0
3*t^2-7/2*t^-1 = 0
t^-1*(3*t^3-7/2) = 0
3*t^3 = 7/2 // : 3
t^3 = 7/6
t^3 = 7/6 // ^ 1/3
t = (7/6)^(1/3)
1/t = 0
1*t^-1 = 0 // : 1
t^-1 = 0
t należy do O
t = (7/6)^(1/3)
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