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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
1.5881 = 10.27/s // - 10.27/s
1.5881-(10.27/s) = 0
1.5881-10.27*s^-1 = 0
-10.27*s^-1 = -1.5881 // : -10.27
s^-1 = 0.15463486
-1 < 0
1/(s^1) = 0.15463486 // * s^1
1 = 0.15463486*s^1 // : 0.15463486
6.46684713 = s^1
s = 6.46684713
s = 6.46684713
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