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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
6/p-12 = 3*p-(15/p)-(3/p)-12 // - 3*p-(15/p)-(3/p)-12
6/p-(3*p)+15/p+3/p-12+12 = 0
6/p-3*p+15/p+3/p-12+12 = 0
24*p^-1-3*p^1 = 0
(24*p^0-3*p^2)/(p^1) = 0 // * p^2
p^1*(24*p^0-3*p^2) = 0
p^1
24-3*p^2 = 0
24-3*p^2 = 0
DELTA = 0^2-(-3*4*24)
DELTA = 288
DELTA > 0
p = (288^(1/2)+0)/(-3*2) or p = (0-288^(1/2))/(-3*2)
p = -2*2^(1/2) or p = 2*2^(1/2)
p in { -2*2^(1/2), 2*2^(1/2)}
p in { -2*2^(1/2), 2*2^(1/2) }
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