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D( x )
(T+r)^2 = 0
(T+r)^2 = 0
(T+r)^2 = 0
x in (-oo:+oo)
p = (e^2*T)/((T+r)^2) // - (e^2*T)/((T+r)^2)
p-((e^2*T)/((T+r)^2)) = 0
(-1*e^2*T)/((T+r)^2)+p = 0
(-1*e^2*T)/((T+r)^2)+(p*(T+r)^2)/((T+r)^2) = 0
p*(T+r)^2-1*e^2*T = 0
T^2*p-e^2*T+2*T*p*r+p*r^2 = 0
(T^2*p-e^2*T+2*T*p*r+p*r^2)/((T+r)^2) = 0
(T^2*p-e^2*T+2*T*p*r+p*r^2)/((T+r)^2) = 0 // * (T+r)^2
T^2*p-e^2*T+2*T*p*r+p*r^2 = 0
x belongs to the empty set
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