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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1/t = 17/2 // - 17/2
1/t-(17/2) = 0
1/t-17/2 = 0
1*t^-1 = 17/2 // : 1
t^-1 = 17/2
-1 < 0
1/(t^1) = 17/2 // * t^1
1 = 17/2*t^1 // : 17/2
2/17 = t^1
t = 2/17
t = 2/17
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