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D( t )
16*t^2+1 = 0
16*t^2+1 = 0
16*t^2+1 = 0
16*t^2 = -1 // : 16
t^2 = -1/16
t in (-oo:+oo)
(4*t)/(16*t^2+1) = 0
4*t = 0 // : 4
t = 0
t = 0
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