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D( t )
1-t = 0
1-t^2 = 0
t+1 = 0
1-t = 0
1-t = 0
1-t = 0 // - 1
-t = -1 // * -1
t = 1
1-t^2 = 0
1-t^2 = 0
-1*t^2 = -1 // : -1
t^2 = 1
t^2 = 1 // ^ 1/2
abs(t) = 1
t = 1 or t = -1
t+1 = 0
t+1 = 0
t+1 = 0 // - 1
t = -1
t in (-oo:-1) U (-1:1) U (1:+oo)
1/(1-t)+6/(t+1)+36/(1-t^2) = 0
(1*(t+1)*(1-t^2))/((1-t)*(t+1)*(1-t^2))+(6*(1-t)*(1-t^2))/((1-t)*(t+1)*(1-t^2))+(36*(1-t)*(t+1))/((1-t)*(t+1)*(1-t^2)) = 0
1*(t+1)*(1-t^2)+6*(1-t)*(1-t^2)+36*(1-t)*(t+1) = 0
5*t^3-7*t^2-36*t^2-5*t+7+36 = 0
5*t^3-43*t^2-5*t+43 = 0
5*t^3-43*t^2-5*t+43 = 0
5*t^3-43*t^2-5*t+43 = 0
{ 1, -1, 43, -43 }
1
t = 1
5*t^3-43*t^2-5*t+43 = 0
1
t-1
5*t^2-38*t-43
5*t^3-43*t^2-5*t+43
t-1
5*t^2-5*t^3
43-38*t^2-5*t
38*t^2-38*t
43-43*t
43*t-43
0
5*t^2-38*t-43 = 0
DELTA = (-38)^2-(-43*4*5)
DELTA = 2304
DELTA > 0
t = (2304^(1/2)+38)/(2*5) or t = (38-2304^(1/2))/(2*5)
t = 43/5 or t = -1
t in { -1, 43/5, 1}
(t+1)*(t-43/5)*(t-1) = 0
((t+1)*(t-43/5)*(t-1))/((1-t)*(t+1)*(1-t^2)) = 0
((t+1)*(t-43/5)*(t-1))/((1-t)*(t+1)*(1-t^2)) = 0 // * (1-t)*(t+1)*(1-t^2)
(t+1)*(t-43/5)*(t-1) = 0
( t+1 )
t+1 = 0 // - 1
t = -1
( t-1 )
t-1 = 0 // + 1
t = 1
( t-43/5 )
t-43/5 = 0 // + 43/5
t = 43/5
t in { -1}
t in { 1}
t = 43/5
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