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D( x )
(s-t)^2 = 0
(s-t)^2 = 0
(s-t)^2 = 0
x in (-oo:+oo)
S^2-((t^2)/((s-t)^2)) = 0
(-1*t^2)/((s-t)^2)+S^2 = 0
(-1*t^2)/((s-t)^2)+(S^2*(s-t)^2)/((s-t)^2) = 0
S^2*(s-t)^2-1*t^2 = 0
S^2*s^2-t^2-2*S^2*s*t+S^2*t^2 = 0
(S^2*s^2-t^2-2*S^2*s*t+S^2*t^2)/((s-t)^2) = 0
(S^2*s^2-t^2-2*S^2*s*t+S^2*t^2)/((s-t)^2) = 0 // * (s-t)^2
S^2*s^2-t^2-2*S^2*s*t+S^2*t^2 = 0
x belongs to the empty set
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