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