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D( t )
t < 0
t < 0
t in <0:+oo)
25 = 5*t^(1/2)-(0.25*t) // - 5*t^(1/2)-(0.25*t)
0.25*t-(5*t^(1/2))+25 = 0
0.25*t-5*t^(1/2)+25 = 0
t_1 = t^(1/2)
0.25*t_1^2-5*t_1^1+25 = 0
0.25*t_1^2-5*t_1+25 = 0
DELTA = (-5)^2-(0.25*4*25)
DELTA = 0
t_1 = 5/(0.25*2)
t_1 = 10 or t_1 = 10
t_1 = 10
t^(1/2)-10 = 0
1*t^(1/2) = 10 // : 1
t^(1/2) = 10
t^(1/2) = 10 // ^ 2
t = 100
t_1 = 10
t^(1/2)-10 = 0
1*t^(1/2) = 10 // : 1
t^(1/2) = 10
t^(1/2) = 10 // ^ 2
t = 100
t in { 100, 100 }
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