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D( t )
t < 0
t < 0
t in <0:+oo)
t^2-(2*t^(1/4)) = 0
t^2-2*t^(1/4) = 0
t_1 = t^(1/4)
1*t_1^8-2*t_1^1 = 0
t_1^8-2*t_1 = 0
t_1*(t_1^7-2) = 0
1*t_1^7 = 2 // : 1
t_1^7 = 2
t_1^7 = 2 // ^ 1/7
t_1 = 2^(1/7)
t_1 = 0
t_1 = 0
t_1 = 2^(1/7)
t^(1/4)-2^(1/7) = 0
1*t^(1/4) = 2^(1/7) // : 1
t^(1/4) = 2^(1/7)
t^(1/4) = 2^(1/7) // ^ 4
t = 2^(4/7)
t_1 = 0
t^(1/4)+0 = 0
t^(1/4) = 0
1*t^(1/4) = 0 // : 1
t^(1/4) = 0
t = 0
t in { 2^(4/7), 0 }
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