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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2*p-(12/p)-6 = 0
2*p-12*p^-1-6 = 0
2*p^1-12*p^-1-6*p^0 = 0
(2*p^2-6*p^1-12*p^0)/(p^1) = 0 // * p^2
p^1*(2*p^2-6*p^1-12*p^0) = 0
p^1
2*p^2-6*p-12 = 0
2*p^2-6*p-12 = 0
DELTA = (-6)^2-(-12*2*4)
DELTA = 132
DELTA > 0
p = (132^(1/2)+6)/(2*2) or p = (6-132^(1/2))/(2*2)
p = (2*33^(1/2)+6)/4 or p = (6-2*33^(1/2))/4
p in { (6-2*33^(1/2))/4, (2*33^(1/2)+6)/4}
p in { (6-2*33^(1/2))/4, (2*33^(1/2)+6)/4 }
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