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D( p )
p^3+4*p^2+5*p = 0
p^3+4*p^2+5*p = 0
p^3+4*p^2+5*p = 0
p^3+4*p^2+5*p = 0
p*(p^2+4*p+5) = 0
p^2+4*p+5 = 0
DELTA = 4^2-(1*4*5)
DELTA = -4
DELTA < 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
(2*p+3)/(p^3+4*p^2+5*p) = 0
p^3+4*p^2+5*p = 0
p*(p^2+4*p+5) = 0
p^2+4*p+5 = 0
DELTA = 4^2-(1*4*5)
DELTA = -4
DELTA < 0
p = 0
(2*p+3)/p = 0
2*p+3 = 0 // - 3
2*p = -3 // : 2
p = -3/2
p = -3/2
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