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D( t )
t < 0
t < 0
t in <0:+oo)
6*t^(1/2)-(6*t) = 0
6*t^(1/2)-6*t = 0
t_1 = t^(1/2)
6*t_1^1-6*t_1^2 = 0
6*t_1-6*t_1^2 = 0
DELTA = 6^2-(-6*0*4)
DELTA = 36
DELTA > 0
t_1 = (36^(1/2)-6)/(-6*2) or t_1 = (-36^(1/2)-6)/(-6*2)
t_1 = 0 or t_1 = 1
t_1 = 0
t^(1/2)+0 = 0
t^(1/2) = 0
1*t^(1/2) = 0 // : 1
t^(1/2) = 0
t = 0
t_1 = 1
t^(1/2)-1 = 0
1*t^(1/2) = 1 // : 1
t^(1/2) = 1
t^(1/2) = 1 // ^ 2
t = 1
t in { 0, 1 }
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