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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4 = -16/t // + -16/t
4-(-16/t) = 0
16*t^-1+4 = 0
16*t^-1 = -4 // : 16
t^-1 = -1/4
-1 < 0
1/(t^1) = -1/4 // * t^1
1 = -1/4*t^1 // : -1/4
-4 = t^1
t = -4
t = -4
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