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D( t )
t-4 = 0
t-4 = 0
t-4 = 0
t-4 = 0 // + 4
t = 4
t in (-oo:4) U (4:+oo)
(t^2-16)/(t-4) = 0
1*t^2 = 16 // : 1
t^2 = 16
t^2 = 16 // ^ 1/2
abs(t) = 4
t = 4 or t = -4
t in { 4}
t = -4
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