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D( t )
t < 0
t < 0
t in <0:+oo)
t^(1/2)-(16*t^(1/4))+64 = 0
t^(1/2)-16*t^(1/4)+64 = 0
t_1 = t^(1/4)
1*t_1^2-16*t_1^1+64 = 0
t_1^2-16*t_1+64 = 0
DELTA = (-16)^2-(1*4*64)
DELTA = 0
t_1 = 16/(1*2)
t_1 = 8 or t_1 = 8
t_1 = 8
t^(1/4)-8 = 0
1*t^(1/4) = 8 // : 1
t^(1/4) = 8
t^(1/4) = 8 // ^ 4
t = 4096
t_1 = 8
t^(1/4)-8 = 0
1*t^(1/4) = 8 // : 1
t^(1/4) = 8
t^(1/4) = 8 // ^ 4
t = 4096
t in { 4096, 4096 }
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