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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
3/t = 5/4+3/4 // - 5/4+3/4
3/t-(5/4)-(3/4) = 0
3/t-5/4-3/4 = 0
3*t^-1 = 2 // : 3
t^-1 = 2/3
-1 < 0
1/(t^1) = 2/3 // * t^1
1 = 2/3*t^1 // : 2/3
3/2 = t^1
t = 3/2
t = 3/2
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