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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
0.4^0.4 = 100/t // - 100/t
0.4^0.4-(100/t) = 0
0.4^0.4-100*t^-1 = 0
-100*t^-1 = -0.4^0.4 // : -100
t^-1 = (0.4^0.4)/100
-1 < 0
1/(t^1) = (0.4^0.4)/100 // * t^1
1 = ((0.4^0.4)/100)*t^1 // : (0.4^0.4)/100
100*0.4^-0.4 = t^1
t = 100*0.4^-0.4
t = 100*0.4^-0.4
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