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D( t )
t < 0
t < 0
t in <0:+oo)
t^(1/2)-(10*t^(1/4))+25 = 0
t^(1/2)-10*t^(1/4)+25 = 0
t_1 = t^(1/4)
1*t_1^2-10*t_1^1+25 = 0
t_1^2-10*t_1+25 = 0
DELTA = (-10)^2-(1*4*25)
DELTA = 0
t_1 = 10/(1*2)
t_1 = 5 or t_1 = 5
t_1 = 5
t^(1/4)-5 = 0
1*t^(1/4) = 5 // : 1
t^(1/4) = 5
t^(1/4) = 5 // ^ 4
t = 625
t_1 = 5
t^(1/4)-5 = 0
1*t^(1/4) = 5 // : 1
t^(1/4) = 5
t^(1/4) = 5 // ^ 4
t = 625
t in { 625, 625 }
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