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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
1/s = 4/11 // - 4/11
1/s-(4/11) = 0
1/s-4/11 = 0
1*s^-1 = 4/11 // : 1
s^-1 = 4/11
-1 < 0
1/(s^1) = 4/11 // * s^1
1 = 4/11*s^1 // : 4/11
11/4 = s^1
s = 11/4
s = 11/4
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