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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
5.65/3.93 = 6.79/t // - 6.79/t
5.65/3.93-(6.79/t) = 0
5.65/3.93-6.79*t^-1 = 0
-6.79*t^-1 = -1.43765903 // : -6.79
t^-1 = 0.21173182
-1 < 0
1/(t^1) = 0.21173182 // * t^1
1 = 0.21173182*t^1 // : 0.21173182
4.72295567 = t^1
t = 4.72295567
t = 4.72295567
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