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D( t )
t^2 = 0
t = 0
t^2 = 0
t^2 = 0
1*t^2 = 0 // : 1
t^2 = 0
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1/t-1 = 3/(t^2)-1 // - 3/(t^2)-1
1/t-(3/(t^2))-1+1 = 0
1/t-3*t^-2-1+1 = 0
t^-1-3*t^-2 = 0
t_1 = t^-1
1*t_1^1-3*t_1^2 = 0
t_1-3*t_1^2 = 0
DELTA = 1^2-(-3*0*4)
DELTA = 1
DELTA > 0
t_1 = (1^(1/2)-1)/(-3*2) or t_1 = (-1^(1/2)-1)/(-3*2)
t_1 = 0 or t_1 = 1/3
t_1 = 0
t^-1+0 = 0
t^-1 = 0
1*t^-1 = 0 // : 1
t^-1 = 0
t należy do O
t_1 = 1/3
t^-1-1/3 = 0
1*t^-1 = 1/3 // : 1
t^-1 = 1/3
-1 < 0
1/(t^1) = 1/3 // * t^1
1 = 1/3*t^1 // : 1/3
3 = t^1
t = 3
t = 3
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