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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
-15/4 = 30/t // - 30/t
-(30/t)-15/4 = 0
-30*t^-1-15/4 = 0
-30*t^-1 = 15/4 // : -30
t^-1 = -1/8
-1 < 0
1/(t^1) = -1/8 // * t^1
1 = -1/8*t^1 // : -1/8
-8 = t^1
t = -8
t = -8
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