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