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