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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(3*t^-1)/4-t^2 = 0
3/4*t^-1-t^2 = 0
t^-1*(3/4-t^3) = 0
-1*t^3 = -3/4 // : -1
t^3 = 3/4
t^3 = 3/4 // ^ 1/3
t = (3/4)^(1/3)
1/t = 0
1*t^-1 = 0 // : 1
t^-1 = 0
t naleu017Cy do O
t = (3/4)^(1/3)
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