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D( t )
t-1 = 0
t = 0
t-1 = 0
t-1 = 0
t-1 = 0 // + 1
t = 1
t = 0
t = 0
t in (-oo:0) U (0:1) U (1:+oo)
195/t = 195/(t-1)-4 // - 195/(t-1)-4
195/t-(195/(t-1))+4 = 0
195/t-195*(t-1)^-1+4 = 0
195/t-195/(t-1)+4 = 0
(-195*t)/(t*(t-1))+(195*(t-1))/(t*(t-1))+(4*t*(t-1))/(t*(t-1)) = 0
195*(t-1)+4*t*(t-1)-195*t = 0
4*t^2-4*t-195 = 0
4*t^2-4*t-195 = 0
4*t^2-4*t-195 = 0
DELTA = (-4)^2-(-195*4*4)
DELTA = 3136
DELTA > 0
t = (3136^(1/2)+4)/(2*4) or t = (4-3136^(1/2))/(2*4)
t = 15/2 or t = -13/2
(t+13/2)*(t-15/2) = 0
((t+13/2)*(t-15/2))/(t*(t-1)) = 0
((t+13/2)*(t-15/2))/(t*(t-1)) = 0 // * t*(t-1)
(t+13/2)*(t-15/2) = 0
( t+13/2 )
t+13/2 = 0 // - 13/2
t = -13/2
( t-15/2 )
t-15/2 = 0 // + 15/2
t = 15/2
t in { -13/2, 15/2 }
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