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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5*p-(5/p) = 0
5*p-5*p^-1 = 0
5*p^1-5*p^-1 = 0
(5*p^2-5*p^0)/(p^1) = 0 // * p^2
p^1*(5*p^2-5*p^0) = 0
p^1
5*p^2-5 = 0
5*p^2-5 = 0
DELTA = 0^2-(-5*4*5)
DELTA = 100
DELTA > 0
p = (100^(1/2)+0)/(2*5) or p = (0-100^(1/2))/(2*5)
p = 1 or p = -1
p in { -1, 1}
p in { -1, 1 }
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