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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
31/2 = 62/t // - 62/t
31/2-(62/t) = 0
31/2-62*t^-1 = 0
-62*t^-1 = -31/2 // : -62
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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