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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
s+26/s = 62/s // - 62/s
s+26/s-(62/s) = 0
s+26/s-62*s^-1 = 0
1*s^1-36*s^-1 = 0
(1*s^2-36*s^0)/(s^1) = 0 // * s^2
s^1*(1*s^2-36*s^0) = 0
s^1
s^2-36 = 0
s^2-36 = 0
DELTA = 0^2-(-36*1*4)
DELTA = 144
DELTA > 0
s = (144^(1/2)+0)/(1*2) or s = (0-144^(1/2))/(1*2)
s = 6 or s = -6
s in { -6, 6}
s in { -6, 6 }
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