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D( T )
T-2 = 0
T-2 = 0
T-2 = 0
T-2 = 0 // + 2
T = 2
T in (-oo:2) U (2:+oo)
1/(T-2) = T/8 // - T/8
1/(T-2)-(T/8) = 0
1/(T-2)-T/8 = 0
(1*8)/(8*(T-2))+(-T*(T-2))/(8*(T-2)) = 0
1*8-T*(T-2) = 0
2*T-T^2+8 = 0
2*T-T^2+8 = 0
2*T-T^2+8 = 0
DELTA = 2^2-(-1*4*8)
DELTA = 36
DELTA > 0
T = (36^(1/2)-2)/(-1*2) or T = (-36^(1/2)-2)/(-1*2)
T = -2 or T = 4
(T+2)*(T-4) = 0
((T+2)*(T-4))/(8*(T-2)) = 0
((T+2)*(T-4))/(8*(T-2)) = 0 // * 8*(T-2)
(T+2)*(T-4) = 0
( T+2 )
T+2 = 0 // - 2
T = -2
( T-4 )
T-4 = 0 // + 4
T = 4
T in { -2, 4 }
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