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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
11/p-(p/4) = 0
11*p^-1-1/4*p^1 = 0
(11*p^0-1/4*p^2)/(p^1) = 0 // * p^2
p^1*(11*p^0-1/4*p^2) = 0
p^1
(-1/4)*p^2+11 = 0
(-1/4)*p^2+11 = 0
DELTA = 0^2-(4*11*(-1/4))
DELTA = 11
DELTA > 0
p = (11^(1/2)+0)/(2*(-1/4)) or p = (0-11^(1/2))/(2*(-1/4))
p = -2*11^(1/2) or p = 2*11^(1/2)
p in { -2*11^(1/2), 2*11^(1/2)}
p in { -2*11^(1/2), 2*11^(1/2) }
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