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D( s )
s^2 = 0
s^2 = 0
s^2 = 0
1*s^2 = 0 // : 1
s^2 = 0
s = 0
s in (-oo:0) U (0:+oo)
s-(32000/(s^2)) = 0
s-32000*s^-2 = 0
s-32000*s^-2 = 0
s*(1-32000*s^-3) = 0
-32000*s^-3 = -1 // : -32000
s^-3 = 1/32000
-3 < 0
1/(s^3) = 1/32000 // * s^3
1 = 1/32000*s^3 // : 1/32000
32000 = s^3
s^3 = 32000 // ^ 1/3
s = 20*4^(1/3)
s = 0
s = 0
s in { 0}
s = 20*4^(1/3)
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