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D( t )
t/2 < 0
t/2 < 0
t/2 < 0
1/2*t+0 < 0 // - 0
1/2*t < 0 // : 1/2
t < 0/1/2
t < 0
t in <0:+oo)
(t/2)^12.8 = 0
(1/2)^12.8*t^12.8 = 0 // : (1/2)^12.8
t^12.8 = 0
t = 0
t = 0
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