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D( s )
s-2 = 0
s^2-16 = 0
1/(s-2) = 0
s-2 = 0
s-2 = 0
s-2 = 0 // + 2
s = 2
s^2-16 = 0
s^2-16 = 0
1*s^2 = 16 // : 1
s^2 = 16
s^2 = 16 // ^ 1/2
abs(s) = 4
s = 4 or s = -4
1/(s-2) = 0
1/(s-2) = 0
s in (-oo:-4) U (-4:2) U (2:4) U (4:+oo)
(4/(s^2-16))/(1/(s-2)) = 0
(4*(s-2))/(1*(s^2-16)) = 0
s-2 = 0 // + 2
s = 2
s in { 2}
s belongs to the empty set
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