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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
0.23/t = 0.6/0.15 // - 0.6/0.15
0.23/t-(0.6/0.15) = 0
0.23/t-4 = 0
0.23*t^-1 = 4 // : 0.23
t^-1 = 17.39130435
-1 < 0
1/(t^1) = 17.39130435 // * t^1
1 = 17.39130435*t^1 // : 17.39130435
0.0575 = t^1
t = 0.0575
t = 0.0575
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