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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)
11-(1/t) = 10/(t^2) // - 10/(t^2)
11-(1/t)-(10/(t^2)) = 0
11-t^-1-10*t^-2 = 0
t_1 = t^-1
11-10*t_1^2-1*t_1^1 = 0
11-10*t_1^2-t_1 = 0
DELTA = (-1)^2-(-10*4*11)
DELTA = 441
DELTA > 0
t_1 = (441^(1/2)+1)/(-10*2) or t_1 = (1-441^(1/2))/(-10*2)
t_1 = -11/10 or t_1 = 1
t_1 = -11/10
t^-1+11/10 = 0
1*t^-1 = -11/10 // : 1
t^-1 = -11/10
-1 < 0
1/(t^1) = -11/10 // * t^1
1 = -11/10*t^1 // : -11/10
-10/11 = t^1
t = -10/11
t_1 = 1
t^-1-1 = 0
1*t^-1 = 1 // : 1
t^-1 = 1
-1 < 0
1/(t^1) = 1 // * t^1
1 = 1*t^1 // : 1
1 = t^1
t = 1
t in { -10/11, 1 }
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