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D( t )
t+3 = 0
t+3 = 0
t+3 = 0
t+3 = 0 // - 3
t = -3
t in (-oo:-3) U (-3:+oo)
(4/16)*t*((t^2-9)/(t+3)) = 0
(1/4*t*(t^2-9))/(t+3) = 0
( 1/4*t )
1/4*t = 0 // : 1/4
t = 0
( t^2-9 )
1*t^2 = 9 // : 1
t^2 = 9
t^2 = 9 // ^ 1/2
abs(t) = 3
t = 3 or t = -3
t in { -3}
t in { 0, 3 }
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