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D( t )
4*t = 0
4*t = 0
4*t = 0
4*t = 0 // : 4
t = 0
t in (-oo:0) U (0:+oo)
(26*t-2)/(4*t) = 0
26*t-2 = 0 // + 2
26*t = 2 // : 26
t = 2/26
t = 1/13
t = 1/13
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