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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
9*t^2+4/t = 0
9*t^2+4*t^-1 = 0
t^-1*(9*t^3+4) = 0
9*t^3 = -4 // : 9
t^3 = -4/9
t^3 = -4/9 // ^ 1/3
t = -(4/9)^(1/3)
1/t = 0
1*t^-1 = 0 // : 1
t^-1 = 0
t naleu017Cy do O
t = -(4/9)^(1/3)
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